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Abstract:

A terminal apparatus which performs periodic channel state information
reporting to a base station apparatus, the terminal apparatus including a
reception unit that receives first information, second information, and
index information indicating a value for reporting periodicity of the
channel state information, from the base station apparatus, and a
transmission control unit that determines the value for reporting
periodicity of the channel state information on the basis of the index
information, in which the applicable value is based on a certain UL-DL
configuration, in which, in a case where the second information is not
configured, the certain UL-DL configuration is a UL-DL configuration
indicated by the first information, and in which, in a case where the
second information is configured, the certain UL-DL configuration is a
UL-DL configuration indicated by the second information. Consequently, in
a radio communication system which employs dynamic TDD, interference with
a downlink signal is avoided, and an uplink control signal is
transmitted.

Claims:

1-15. (canceled)

16. A terminal apparatus which is configured to and/or programmed to
perform periodic channel state information reporting to a base station
apparatus, the terminal apparatus comprising: a receiver configured to
and/or programmed to receive first information, second information, and
index information indicating a periodicity value for the channel state
information reporting, from the base station apparatus; and a
transmission control circuit configured to and/or programmed to determine
the periodicity value for the channel state information reporting based
on the index information, wherein the periodicity value is one of one or
a plurality of periodicity values which depends on at least a UL-DL
configuration, in a case where the second information is configured, the
UL-DL configuration is indicated by the second information, and in a case
where the second information is not configured, the UL-DL configuration
is indicated by the first information.

17. The terminal apparatus according to claim 16, wherein the receiver is
configured to and/or programmed to receive third information, and a UL-DL
configuration indicated by the third information is used for channel
state information measurement.

18. The terminal apparatus according to claim 16, wherein each of the
first information and the second information corresponds to a primary
cell.

19. The terminal apparatus according to claim 16, wherein in a case where
the second information is configured, a scheduling timing of a physical
uplink shared channel is set according to a UL-DL configuration indicated
by the first information, and a downlink HARQ timing is set according to
a UL-DL configuration indicated by the second information.

20. The terminal apparatus according to claim 16, wherein in a case where
the second information is not configured, an uplink scheduling timing and
a downlink HARQ timing are set according to a UL-DL configuration
indicated by the first information.

21. The terminal apparatus according to claim 16, wherein the index
information indicates an offset value for the channel state information
reporting.

22. A base station apparatus which is configured to and/or programmed to
receive periodic channel state information reporting from a terminal
apparatus, the base station apparatus comprising: a CSI transmission
timing determiner configured to and/or programmed to generate index
information indicating a periodicity value for the channel state
information reporting; and a transmitter configured to and/or programmed
to transmit first information, second information, and the index
information to the terminal apparatus, wherein the periodicity value is
one of one or a plurality of periodicity values which depends on at least
a UL-DL configuration, and in a case where the second information is
configured, a scheduling timing of a physical uplink shared channel is
set according to a UL-DL configuration indicated by the first
information, a downlink HARQ timing is set according to a UL-DL
configuration indicated by the second information, and the UL-DL
configuration is indicated by the second information.

23. The base station apparatus according to claim 22, wherein in a case
where the second information is not configured, an uplink scheduling
timing and a downlink HARQ timing are set according to a UL-DL
configuration indicated by the first information, and the UL-DL
configuration is indicated by the first information.

24. The base station apparatus according to claim 22, wherein the
transmitter is configured to and/or programmed to transmit third
information, and a UL-DL configuration indicated by the third information
is used for channel state information measurement.

25. The base station apparatus according to claim 22, wherein each of the
first information and the second information corresponds to a primary
cell.

26. The base station apparatus according to claim 22, wherein the index
information generated by the CSI transmission timing determiner indicates
an offset value for the channel state information reporting.

27. An integrated circuit mounted in a terminal apparatus which is
configured to and/or programmed to perform periodic channel state
information reporting to a base station apparatus, the integrated circuit
causing the terminal apparatus to realize a series of functions
comprising: a function of receiving first information, second
information, and index information indicating a periodicity value for the
channel state information reporting, from the base station apparatus; and
a function of determining the periodicity value for the channel state
information reporting based on the index information, wherein the
periodicity value is one of one or a plurality of periodicity values
which depends on at least a UL-DL configuration, in a case where the
second information is configured, the UL-DL configuration is indicated by
the second information, and in a case where the second information is not
configured, the UL-DL configuration is indicated by the first
information.

28. An integrated circuit mounted in a base station apparatus which is
configured to and/or programmed to receive periodic channel state
information reporting from a terminal apparatus, the integrated circuit
causing the base station apparatus to realize a series of functions
comprising: a function of generating index information indicating a
periodicity value for the channel state information reporting; and a
function of transmitting first information, second information, and the
index information to the terminal apparatus, wherein the periodicity
value is one of one or a plurality of periodicity values which depends on
at least a UL-DL configuration, and in a case where the second
information is configured, a scheduling timing of a physical uplink
shared channel is set according to a UL-DL configuration indicated by the
first information, a downlink HARQ timing is set according to a UL-DL
configuration indicated by the second information, and the UL-DL
configuration is indicated by the second information.

29. A radio communication method used for a terminal apparatus which is
configured to and/or programmed to perform periodic channel state
information reporting to a base station apparatus, the radio
communication method comprising: receiving first information, second
information, and index information indicating a periodicity value for the
channel state information reporting, from the base station apparatus; and
determining the periodicity value for the channel state information
reporting based on the index information, wherein the periodicity value
is one of one or a plurality of periodicity values which depends on at
least a UL-DL configuration, in a case where the second information is
configured, the UL-DL configuration is indicated by the second
information, and in a case where the second information is not
configured, the UL-DL configuration is indicated by the first
information.

30. A radio communication method used for a base station apparatus which
is configured to and/or programmed to receive periodic channel state
information reporting from a terminal apparatus, the radio communication
method comprising: generating index information indicating a periodicity
value for the channel state information reporting; and transmitting first
information, second information, and the index information to the
terminal apparatus, wherein the periodicity value is one of one or a
plurality of periodicity values which depends on at least a UL-DL
configuration, and in a case where the second information is configured,
a scheduling timing of a physical uplink shared channel is set according
to a UL-DL configuration indicated by the first information, a downlink
HARQ timing is set according to a UL-DL configuration indicated by the
second information, and the UL-DL configuration is indicated by the
second information.

Description:

TECHNICAL FIELD

[0001] The present invention relates to a terminal apparatus, a base
station apparatus, an integrated circuit, and a radio communication
method.

[0002] This application claims the benefit of Japanese Patent Application
No. 2013-128437 filed Jun. 19, 2013, the entire contents of which are
incorporated herein by reference.

BACKGROUND ART

[0003] A radio access method and a radio network (hereinafter, referred to
as Long-Term Evolution (LTE) or Evolved Universal Terrestrial Radio
Access (EUTRA)) of cellular mobile communication have been examined in
the Third Generation Partnership Project (3GPP). In LTE, an orthogonal
frequency division multiplexing (OFDM) method is used for a downlink. In
LTE, a single-carrier frequency division multiple access (SC-FDMA) method
is used for an uplink. In LTE, a base station apparatus is also referred
to as evolved NodeB (eNodeB), and a mobile station apparatus is also
referred to as user equipment (UE). LTE is a cellular communication
system in which a plurality of areas covered by a base station apparatus
are allocated in a cell form. A single base station apparatus may manage
a plurality of cells.

[0004] LTE corresponds to time division duplex (TDD). LTE employing the
TDD is also referred to as TD-LTE or LTE TDD. The TDD is a technique
which can realize full-duplex communication in a single frequency band
through time division multiplexing of an uplink signal and a downlink
signal.

[0005] In the 3GPP, it has been examined that a traffic adaptation
technique and an interference reduction technique (DL-UL interference
management and traffic adaptation) in which a ratio of an uplink resource
and a downlink resource is changed depending on uplink traffic and
downlink traffic are applied to the TD-LTE.

[0006] In NPL 1, a method of using a flexible subframe is proposed as a
method of realizing traffic adaptation. A base station apparatus can
receive an uplink signal or transmit a downlink signal in a flexible
subframe. In NPL 1, a mobile station apparatus regards the flexible
subframe as a downlink subframe unless the mobile station apparatus is
instructed to transmit an uplink signal in the flexible subframe by the
base station apparatus. The traffic adaptation technique is also referred
to as dynamic TDD.

[0007] NPL 1 discloses that a hybrid automatic repeat request (HARQ)
timing for a physical downlink shared channel (PDSCH) is determined on
the basis of an uplink-downlink configuration which is newly introduced,
and that HARQ timing for a physical uplink shared channel (PUSCH) is
determined on the basis of the initial UL-DL configuration.

[0008] NPL 2 discloses that (a) a UL/DL reference configuration is
introduced, and (b) several subframes may be scheduled to be used for
either an uplink or a downlink through dynamic grant/assignment from a
scheduler.

[0009] In LTE release 10, a carrier aggregation technique is introduced in
which a plurality of cells are set for a mobile station apparatus.

[0012] Throughput can be considerably improved in a case where the dynamic
TDD is applied compared with a case where the ratio of an uplink resource
and a downlink resource is not changed. However, in a radio communication
system which employs the dynamic TDD, in a case where an uplink-downlink
configuration applied to a mobile station apparatus which transmits an
uplink control signal is different from an uplink-downlink configuration
applied to another mobile station apparatus inside or outside a cell,
there is a problem in that a downlink signal which is transmitted by
another mobile station apparatus at the same time interferes with the
uplink control signal, and thus a reception characteristic of the uplink
control signal deteriorates.

[0013] An aspect of the present invention has been made in consideration
of the problem, and an object thereof is to provide a terminal apparatus
an integrated circuit, and a radio communication method capable of
avoiding interference with a downlink signal and transmitting an uplink
control signal in a radio communication system which employs dynamic TDD.

Means for Solving the Problems

[0014] (1) In order to achieve the above-described object, the present
invention provides the following means. In other words, according to an
aspect of the present invention, there is provided a terminal apparatus
which performs periodic channel state information reporting to a base
station apparatus, the terminal apparatus including a reception unit that
receives first information, second information, and index information
indicating a value for reporting periodicity of the channel state
information, from the base station apparatus; and a transmission control
unit that determines the value for reporting periodicity of the channel
state information on the basis of the index information, in which the
applicable value is based on a certain UL-DL configuration, in which, in
a case where the second information is not configured, the certain UL-DL
configuration is a UL-DL configuration indicated by the first
information, and in which, in a case where the second information is
configured, the certain UL-DL configuration is a UL-DL configuration
indicated by the second information.

[0015] (2) In addition, in the aspect of the present invention, the
reception unit of the terminal apparatus receives third information, and
a UL-DL configuration indicated by the third information is used for the
channel state information measurement.

[0016] (3) Further, in the aspect of the present invention, each of the
first information and the second information in the terminal apparatus
corresponds to a primary cell.

[0017] (4) In addition, in the aspect of the present invention, in a case
where the second information is configured, a scheduling timing of a
physical uplink shared channel in the terminal apparatus is set according
to a UL-DL configuration indicated by the first information, and a
downlink HARQ timing in the terminal apparatus is set according to a
UL-DL configuration indicated by the second information.

[0018] (5) Further, in the aspect of the present invention, in a case
where the second information is configured, an uplink scheduling timing
and a downlink HARQ timing in the terminal apparatus are set according to
a UL-DL configuration indicated by the first information.

[0019] (6) In addition, in the aspect of the present invention, the index
information in the terminal apparatus indicates an offset value for the
channel state information reporting.

[0020] (7) Further, according to another aspect of the present invention,
there is provided a base station apparatus which receives periodic
channel state information reporting from a terminal apparatus, the base
station apparatus including a CSI transmission timing determination unit
that generates index information indicating a value for reporting
periodicity of the channel state information; and a transmission unit
that transmits first information, second information, and the index
information to the terminal apparatus, in which the applicable value is
based on a certain UL-DL configuration, in which, in a case where the
second information is configured, a scheduling timing of a physical
uplink shared channel is set according to a UL-DL configuration indicated
by the first information, a downlink HARQ timing is set according to a
UL-DL configuration indicated by the second information, and the certain
UL-DL configuration is the UL-DL configuration indicated by the second
information.

[0021] (8) In addition, in the aspect of the present invention, in a case
where the second information is not configured, an uplink scheduling
timing and a downlink HARQ timing in the base station apparatus are set
according to a UL-DL configuration indicated by the first information,
and the certain UL-DL configuration is the UL-DL configuration indicated
by the first information.

[0022] (9) Further, in the aspect of the present invention, the
transmission unit of the base station apparatus transmits third
information, and a UL-DL configuration indicated by the third information
is used for the channel state information measurement.

[0023] (10) In addition, in the aspect of the present invention, each of
the first information and the second information in the base station
apparatus corresponds to a primary cell.

[0024] (11) Further, in the aspect of the present invention, the index
information generated by the CSI transmission timing determination unit
of the base station apparatus indicates an offset value for the channel
state information reporting.

[0025] (12) In addition, according to still another aspect of the present
invention, there is provided an integrated circuit mounted in a terminal
apparatus which performs periodic channel state information reporting to
a base station apparatus, the integrated circuit causing the terminal
apparatus to realize a series of functions including a function of
receiving first information, second information, and index information
indicating a value for reporting periodicity of the channel state
information, from the base station apparatus; and a function of
determining the value for reporting periodicity of the channel state
information on the basis of the index information, in which the
applicable value is based on a certain UL-DL configuration, in which, in
a case where the second information is not configured, the certain UL-DL
configuration is a UL-DL configuration indicated by the first
information, and in which, in a case where the second information is
configured, the certain UL-DL configuration is a UL configuration
indicated by the second information.

[0026] (13) Further, according to still another aspect of the present
invention, there is provided an integrated circuit mounted in a base
station apparatus which receives periodic channel state information
reporting from a terminal apparatus, the integrated circuit causing the
base station apparatus to realize a series of functions including a
function of generating index information indicating a value for reporting
periodicity of the channel state information; and a function of
transmitting first information, second information, and the index
information to the terminal apparatus, in which the applicable value is
based on a certain UL-DL configuration, in which, in a case where the
second information is configured, a scheduling timing of a physical
uplink shared channel is set according to a UL-DL configuration indicated
by the first information, a downlink HARQ timing is set according to a
UL-DL configuration indicated by the second information, and the certain
UL-DL configuration is the UL-DL configuration indicated by the second
information.

[0027] (14) In addition, according to still another aspect of the present
invention, there is provided a radio communication method used for a
terminal apparatus which performs periodic channel state information
reporting to a base station apparatus, the method including receiving
first information, second information, and index information indicating a
value for reporting periodicity of the channel state information, from
the base station apparatus; and determining the value for reporting
periodicity of the channel state information on the basis of the index
information, in which the applicable value is based on a certain UL-DL
configuration, in which, in a case where the second information is not
configured, the certain UL-DL configuration is a UL-DL configuration
indicated by the first information, and in which, in a case where the
second information is configured, the certain UL-DL configuration is a
UL-DL configuration indicated by the second information.

[0028] (15) Further, according to still another aspect of the present
invention, there is provided a radio communication method used for a base
station apparatus which receives periodic channel state information
reporting from a terminal apparatus, the method including generating
index information indicating a value for reporting periodicity of the
channel state information; and transmitting first information, second
information, and the index information to the terminal apparatus, in
which the applicable value is based on a certain UL-DL configuration, in
which, in a case where the second information is configured, a scheduling
timing of a physical uplink shared channel is set according to a UL-DL
configuration indicated by the first information, downlink HARQ timing is
set according to a UL-DL configuration indicated by the second
information, and the certain UL-DL configuration is the UL-DL
configuration indicated by the second information.

Effects of the Invention

[0029] According to an aspect of the present invention, it is possible to
avoid interference with a downlink signal and to transmit an uplink
control signal in a radio communication system which employs dynamic TDD.

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG. 1 is a conceptual diagram of a radio communication system of
the present embodiment.

[0031] FIG. 2 is a diagram illustrating a schematic configuration of a
radio frame of the present embodiment.

[0032] FIG. 3 is a diagram illustrating a configuration of a slot of the
present embodiment.

[0033] FIG. 4 is a diagram illustrating an example in which a physical
channel and a physical signal are mapped in a downlink subframe of the
present embodiment.

[0034] FIG. 5 is a diagram illustrating an example in which a physical
channel and a physical signal are mapped in an uplink subframe of the
present embodiment.

[0035] FIG. 6 is a diagram illustrating an example in which a physical
channel and a physical signal are mapped in a special subframe of the
present embodiment.

[0036] FIG. 7 is a table illustrating an example of an uplink-downlink
configuration in the present embodiment.

[0037] FIG. 8 is a flowchart illustrating a setting method of a first
uplink reference UL-DL configuration and a first downlink reference UL-DL
configuration in the present embodiment.

[0038] FIG. 9 is a flowchart illustrating a setting method of a second
uplink reference UL-DL configuration in the present embodiment.

[0039] FIG. 10 is a diagram illustrating a correspondence between a pair
formed by the first uplink reference UL-DL configuration for the other
serving cell (primary cell) and the first uplink reference UL-DL
configuration for a serving cell (secondary cell), and the second uplink
reference UL-DL configuration for the secondary cell in the present
embodiment.

[0040] FIG. 11 is a flowchart illustrating a setting method of a second
downlink reference UL-DL configuration in the present embodiment.

[0041] FIG. 12 is a diagram illustrating a correspondence between a pair
formed by the first downlink reference UL-DL configuration for a primary
cell and the first downlink reference UL-DL configuration for a secondary
cell, and the second downlink reference UL-DL configuration for the
secondary cell, in the present embodiment.

[0042] FIG. 13 is a diagram illustrating a relationship between a subframe
indicated by the first uplink reference UL-DL configuration and a
subframe indicated by the first downlink reference UL-DL configuration in
the present embodiment.

[0043] FIG. 14 is a diagram illustrating a relationship between a subframe
indicated by the first uplink reference UL-DL configuration, a subframe
indicated by the first downlink reference UL-DL configuration, and a
subframe indicated by a transmission direction UL-DL configuration in the
present embodiment.

[0044] FIG. 15 is a diagram illustrating a relationship between the first
uplink reference UL-DL configuration, the first downlink reference UL-DL
configuration, and the transmission direction UL-DL configuration in the
present embodiment.

[0045] FIG. 16 is a diagram illustrating a correspondence between a
subframe n in which PDCCH/EPDCCH/PHICH is allocated, and a subframe n+k
in which a PUSCH corresponding to the PDCCH/EPDCCH/PHICH is allocated.

[0046] FIG. 17 is a diagram illustrating a correspondence between a
subframe n in which a PHICH is allocated, and a subframe n-k in which a
PUSCH corresponding to the PHICH is allocated, in the present embodiment.

[0047] FIG. 18 is a diagram illustrating a correspondence between a
subframe n in which a PUSCH is allocated, and a subframe n+k in which a
PHICH corresponding to the PUSCH is allocated, in the present embodiment.
The mobile station apparatus 1 specifies (selects, determines) a value of
k according to the table of FIG. 20.

[0048] FIG. 19 is a diagram illustrating a correspondence between a
subframe n-k in which a PDSCH is allocated, and a subframe n in which a
HARQ-ACK corresponding to the PDSCH is transmitted, in the present
embodiment.

[0049] FIG. 20 is a diagram illustrating a relationship between a
parameter ICQI/PMI of which a notification is sent in a high layer,
the reporting periodicity Npd of a periodic CSI, and a timing offset
N.sub.OFFSET,CQI in the present embodiment.

[0050] FIG. 21 is a diagram illustrating an example of a subframe in which
a periodic CSI is transmitted in the present embodiment.

[0051] FIG. 22 is a diagram illustrating the first downlink reference
UL-DL configuration, a subframe number serving as an uplink subframe, and
a supported periodic CSI reporting periodicity in the present embodiment.

[0052] FIG. 23 is a flowchart illustrating an example of a process of
restricting (a) periodic CSI reporting periodicity/timing offset on the
basis of the first downlink reference UL-DL configuration in the present
embodiment.

[0053] FIG. 24 is a schematic block diagram illustrating a configuration
of a mobile station apparatus 1 of the present embodiment.

[0054] FIG. 25 is a schematic block diagram illustrating a configuration
of a base station apparatus 3 of the present embodiment.

[0055] FIG. 26 is a diagram illustrating a relationship between a
parameter ISR of which a notification is sent in a high layer, the
periodicity SRPERIODICITY of a subframe in which an SR can be
transmitted, and a timing offset N.sub.OFFSET,SR in the present
embodiment.

[0056] FIG. 27 is a diagram illustrating the first downlink reference
UL-DL configuration, a subframe number serving as an uplink subframe, and
a periodicity of a subframe in which a supported SR can be transmitted in
the present embodiment.

[0057] FIG. 28 is a flowchart illustrating an example of a process of
restricting (a) periodicity/timing offset of a subframe in which the SR
can be transmitted on the basis of the first downlink reference UL-DL
configuration in the present embodiment.

MODE FOR CARRYING OUT THE INVENTION

[0058] Hereinafter, embodiments of the present invention will be
described.

[0059] In the present embodiment, a plurality of cells are set for a
mobile station apparatus. A technique in which the mobile station
apparatus performs communication via the plurality of cells is referred
to as cell aggregation or carrier aggregation. The present invention may
be applied to each of the plurality of cells set for the mobile station
apparatus. In addition, the present invention may be applied to some of
the plurality of set cells. The cell set for the mobile station apparatus
is also referred to as a serving cell.

[0060] The plurality of set serving cells includes a single primary cell
and one or a plurality of secondary cells. The primary cell is a serving
cell on which an initial connection establishment procedure is performed,
a serving cell on which a connection reestablishment procedure is
started, or a cell which is indicated as a primary cell in a handover
procedure. The secondary cell may be set when or after RRC connection is
established.

[0061] A radio communication system of the present embodiment employs a
time division duplex (TDD) method. In a case of cell aggregation, the TDD
method may be applied to all of a plurality of cells or some of the
cells.

[0062] In a case where a plurality of cells to which the TDD is applied
are aggregated, a half-duplex TDD method or a full-duplex TDD method is
applied thereto.

[0063] A mobile station apparatus of the half-duplex TDD method cannot
simultaneously perform uplink transmission and downlink reception in the
plurality of cells to which the TDD is applied. In a case of the
half-duplex TDD, the mobile station apparatus does not simultaneously
perform transmission and reception in a single primary cell in a certain
band, or in a single primary cell and one or a plurality of secondary
cells in a plurality of different bands.

[0064] In the full-duplex TDD method, the mobile station apparatus can
simultaneously perform uplink transmission and downlink reception in a
plurality of cells to which the TDD is applied. In a case of the
full-duplex TDD, the mobile station apparatus can simultaneously perform
transmission and reception in a plurality of serving cells in a plurality
of different bands.

[0065] The mobile station apparatus transmits information indicating
combinations of bands in which carrier aggregation is supported by the
mobile station apparatus, to a base station apparatus. The mobile station
apparatus transmits, to the base station apparatus, information
indicating whether or not simultaneous transmission and reception in the
plurality of serving cells in a plurality of different bands is supported
in each of the combinations of bands.

[0066] In a case where a cell to which the TDD is applied and a cell to
which frequency division duplex (FDD) is applied are aggregated, the
present invention is applicable to the cell to which the TDD is applied.

[0068] FIG. 1 is a conceptual diagram of a radio communication system of
the present embodiment. In FIG. 1, the radio communication system
includes mobile station apparatuses 1A to 1C, and a base station
apparatus 3. Hereinafter, the mobile station apparatuses 1A to 1C are
referred to a "mobile station apparatus 1".

[0069] A physical channel and a physical signal of the present embodiment
will be described.

[0070] In FIG. 1, the following uplink physical channels are used for
uplink radio communication from the mobile station apparatus 1 to the
base station apparatus 3. The uplink physical channels are used to
transmit information which is output by a higher layer.

[0071] Physical
uplink control channel (PUCCH)

[0072] Physical uplink shared channel
(PUSCH)

[0073] Physical random access channel (PRACH)

[0074] The PUCCH is a physical channel used to transmit uplink control
information (UCI). The uplink control information includes channel state
information (CSI) of downlink, a scheduling request (SR) indicating a
request for a PUSCH resource, and acknowledgement (ACK)/negative
acknowledgement ACK (NACK) for downlink data (transport block,
downlink-shared channel: DL-SCH). The ACK/NACK is also referred to as a
HARQ-ACK, HARQ feedback, or response information.

[0075] The PUSCH is a physical channel used to transmit uplink data
(uplink-shared channel: UL-SCH). In addition, the PUSCH may be used to
transmit the HARQ-ACK and/or the CSI along with the uplink data. Further,
the PUSCH may be used to transmit only the CSI, or only the HARQ-ACK and
the CSI.

[0076] The PRACH is a physical channel used to transmit a random access
preamble. The PRACH is mainly used for the mobile station apparatus 1 to
be synchronized with the base station apparatus 3 in a time domain. In
addition, the PRACH is also used to indicate synchronization (timing
adjustment) with an initial connection establishment procedure, a
handover procedure, a connection reestablishment procedure, and uplink
transmission, and to indicate a request for a PUSCH resource.

[0077] In FIG. 1, the following uplink physical signal is used for the
uplink radio communication. The uplink physical signal is not used to
transmit information output from a high layer but is used by a physical
layer.

[0078] Uplink reference signal (UL RS)

[0079] In the present embodiment, the following two types of uplink
reference signals are used.

[0080] Demodulation reference signal (DMRS)

[0081] Sounding reference signal (SRS)

[0082] The DMRS is related to transmission of the PUSCH or the PUCCH. The
DMRS is subject to time division multiplexing with the PUSCH or the
PUCCH. The base station apparatus 3 uses the DMRS to perform channel
correction of the PUSCH or the PUCCH. Hereinafter, transmission of both
of the PUSCH and the DMRS is simply referred to transmission of the
PUSCH. Hereinafter, transmission of both of the PUCCH and the DMRS is
simply referred to transmission of the PUCCH.

[0083] The SRS is not related to transmission of the PUSCH or the PUCCH.
The base station apparatus 3 uses the SRS to measure an uplink channel
state. The mobile station apparatus 1 transmits a first SRS in a first
resource which is set by a high layer. In addition, in a case where
information indicating a request for transmitting the SRS is received via
a PDCCH, the mobile station apparatus 1 transmits a second SRS only once
in a second resource which is set by the high layer. The first SRS is
also referred to as a periodic SRS or a type 0 triggered SRS. The second
SRS is also referred to as an aperiodic SRS or a type 1 triggered SRS.
Transmission of the aperiodic SRS is scheduled by information indicating
a request for transmission of the SRS.

[0084] In FIG. 1, the following downlink physical channels are used for
downlink radio communication from the base station apparatus 3 to the
mobile station apparatus 1. The downlink physical channels are used to
transmit information output from a high layer.

[0092] The PBCH is used to send a notification of master information block
(MIB, or broadcast channel: BCH) which is used in common by the mobile
station apparatuses 1. The MIB is transmitted at intervals of 40 ms, and
the MIB is repeatedly transmitted with periodicity of 10 ms.
Specifically, initial transmission of the MIB is performed in a subframe
0 of a radio frame satisfying SFN mod 4=0, and retransmission
(repetition) of the MIB is performed in subframes 0 of all other radio
frames. The SFN (system frame number) is a radio frame number. The MIB is
system information. For example, the MIB includes information indicating
the SFN.

[0093] The PCFICH is used to transmit information indicating a region
(OFDM symbol) which is used to transmit the PDCCH.

[0094] The PHICH is used to transmit a HARQ indicator (HARQ feedback or
response information) indicating an acknowledgement (ACK) or negative
acknowledgement (NACK) of uplink data (uplink shared channel: UL-SCH)
received by the base station apparatus 3. For example, in a case where a
HARQ indicator indicating an ACK is received, the mobile station
apparatus 1 does not retransmit corresponding uplink data. For example,
in a case where a HARQ indicator indicating a NACK is received, the
mobile station apparatus 1 retransmits corresponding uplink data. A
single PHICH transmits a HARQ indicator for a single item of uplink data.
The base station apparatus 3 transmits respective HARQ indicators for a
plurality of uplink data items included in the same PUSCH, by using a
plurality of PHICHs.

[0095] The PDCCH and the EPDCCH are used to transmit downlink control
information (DCI). The downlink control information is also referred to
as a DCI format. The downlink control information includes a downlink
grant and an uplink grant. The downlink grant is also referred to as
downlink assignment or downlink allocation.

[0096] The downlink grant is used for scheduling a single PDSCH in a
single cell. The downlink grant is used for scheduling a PDSCH in the
same subframe as a subframe in which the downlink grant is transmitted.
The uplink grant is used for scheduling a single PUSCH in a single cell.
The uplink grant is used for scheduling a single PUSCH in a subframe
which occurs four or more subframes later than a subframe in which the
uplink grant is transmitted.

[0097] A cyclic redundancy check (CRC) parity bit is added to the DCI
format. The CRC parity bit is scrambled with a cell-radio network
temporary identifier (C-RNTI), or a semi-persistent scheduling cell-radio
network temporary identifier (SPS C-RNTI). The C-RNTI and the SPS C-RNTI
are identifiers for identifying a mobile station apparatus in a cell.

[0098] The C-RNTI is used to control the PDSCH or the PUSCH in a single
subframe. The SPS C-RNTI is used to periodically allocate a PDSCH or
PUSCH resource.

[0099] The PDSCH is used to transmit downlink data (downlink shared
channel: DL-SCH).

[0100] The PMCH is used to transmit multicast data (multicast channel:
MCH).

[0101] In FIG. 1, the following downlink physical signals are used for the
downlink radio communication. The downlink physical signals are not used
to transmit information output from a high layer but are used by a
physical layer.

[0102] Synchronization signal (SS)

[0103] Downlink
reference signal (DL RS)

[0104] The synchronization signal is used for the mobile station apparatus
1 to perform synchronization of a frequency domain and a time domain of
downlink. In the TDD method, the synchronization signal is mapped in
subframes 0, 1, 5 and 6 of a radio frame. In the FDD method, the
synchronization signal is mapped in subframes 0 and 5 of a radio frame.

[0105] The downlink reference signal is used for the mobile station
apparatus 1 to perform channel correction of the downlink physical
channel. The downlink reference signal is used for the mobile station
apparatus 1 to calculate channel state information of downlink.

[0106] In the present embodiment, the following five types of downlink
reference signals are used.

[0114] The CRS is transmitted with all subframes. The CRS is used to
demodulate PBCH/PDCCH/PHICH/PCFICH/PDSCH. The CRS may be used for the
mobile station apparatus 1 to calculate channel state information of
downlink. The PBCH/PDCCH/PHICH/PCFICH are (is) transmitted via an antenna
port which is used to transmit the CRS.

[0115] The URS related to a PDSCH is transmitted with a subframe and a
band which are used to transmit the PDSCH to which the URS is related.
The URS is used to demodulate a PDSCH to which the URS is related.

[0116] The PDSCH is transmitted via an antenna port which is used to
transmit a CRS or a URS. A DCI format 1A is used for scheduling a PDSCH
which is transmitted via an antenna port used to transmit a CRS. A DCI
format 2D is used for scheduling a PDSCH which is transmitted via an
antenna port used to transmit a URS.

[0117] The DMRS related to an EPDCCH is transmitted with a subframe and a
band which are used to transmit the EPDCCH to which the DMRS is related.
The DMRS is used to demodulate an EPDCCH to which the DMRS is related.
The EPDCCH is transmitted via an antenna port which is used to transmit
the DMRS.

[0118] The NZP CSI-RS is transmitted in a set subframe. A resource in
which the NZP CSI-RS is transmitted is set by the base station apparatus.
The NZP CSI-RS is used for the mobile station apparatus 1 to calculate
channel state information of downlink.

[0119] A resource of the ZP CSI-RS is set by the base station apparatus.
The base station apparatus transmits the ZP CSI-RS with zero output. In
other words, the base station apparatus does not transmit the ZP CSI-RS.
The base station apparatus does not transmit a PDSCH and an EPDCCH in a
set resource of the NZP CSI-RS. For example, the mobile station apparatus
1 can measure interference in a resource corresponding to the NZP CSI-RS
in a certain cell.

[0120] The MBSFN RS is transmitted in all bands of a subframe which is
used to transmit the PMCH. The MBSFN RS is used to decode the PMCH. The
PMCH is transmitted via an antenna port which is used to transmit the
MBSFN RS.

[0121] The PRS is used for the mobile station apparatus to measure a
geographical position thereof.

[0122] The downlink physical channel and the downlink physical signal are
collectively referred to as a downlink signal. The uplink physical
channel and the uplink physical signal are collectively referred to as an
uplink signal. The downlink physical channel and the uplink physical
channel are collectively referred to as a physical channel. The downlink
physical signal and the uplink physical signal are collectively referred
to a physical signal.

[0123] The BCH, the MCH, the UL-SCH and the DL-SCH are transport channels.
A channel used by a medium access control (MAC) layer is referred to as a
transport channel. The unit of the transport channel used by the MAC
layer is referred to as a transport block (TB) or a MAC protocol data
unit (PDU). In the MAC layer, control of a hybrid automatic repeat
request (HARQ) is performed on each transport block. The transport block
is the unit of data which is delivered to a physical layer by the MAC
layer. In the physical layer, the transport block is mapped to a
codeword, and a coding process is performed on each codeword.

[0124] Hereinafter, a configuration of the radio frame of the present
embodiment will be described.

[0125] FIG. 2 is a diagram illustrating a schematic configuration of the
radio frame of the present embodiment. Each radio frame has a length of
10 ms. In FIG. 2, a transverse axis is a time axis. In addition, each
radio frame is constituted by two half frames. Each of the half frames
has a length of 5 ms. Each of the half frames is constituted by five
subframes. Each of the subframes has a length of 1 ms and is defined by
two continuous slots. Each of the slots has a length of 0.5 ms. An i-th
subframe of the radio frame is constituted by a (2×i)-th slot and a
(2×i+1)-th slot. In other words, ten subframes can be used at
intervals of 10 ms.

[0126] In the present embodiment, the following three types of subframes
are defined.

[0127] Downlink subframe (first subframe)

[0128] Uplink
subframe (second subframe)

[0129] Special subframe (third subframe)

[0130] The downlink subframe is a subframe which is reserved for downlink
transmission. The uplink subframe is a subframe which is reserved for
uplink transmission. The special subframe is constituted by three fields.
The three fields are a downlink pilot time slot (DwPTS), a guard period
(GP), and an uplink pilot time slot (UpPTS). A total length of the DwPTS,
the GP, and the UpPTS is 1 ms. The DwPTS is a field which is reserved for
downlink transmission. The UpPTS is a field which is reserved for uplink
transmission. The GP is a field in which downlink transmission and uplink
transmission are not performed. In addition, the special subframe may
consist of only the DwPTS and GP, and may consist of only the GP and the
UpPTS.

[0131] A single radio frame is constituted by at least a downlink
subframe, an uplink subframe, and a special subframe.

[0132] The radio communication system of the present embodiment supports
the downlink-to-uplink switch-point periodicities of 5 ms and 10 ms.

[0133] In a case where the downlink-to-uplink switch-point periodicity is
5 ms, a special subframe is included in both half frames of the radio
frame.

[0134] In a case where the downlink-to-uplink switch-point periodicity is
10 ms, a special subframe is included only in the first half frame of the
radio frame.

[0135] Hereinafter, a configuration of the slot of the present embodiment
will be described.

[0136] FIG. 3 is a diagram illustrating a configuration of the slot of the
present embodiment. A physical signal or a physical channel transmitted
in each slot is expressed by a resource grid. In FIG. 3, a transverse
axis is a time axis, and a longitudinal axis is a frequency axis. In a
downlink, the resource grid is defined by a plurality of subcarriers and
a plurality of OFDM symbols. In an uplink, the resource grid is defined
by a plurality of subcarriers and a plurality of SC-FDMA symbols. The
number of subcarriers forming a single slot depends on a bandwidth of a
cell. The number of OFDM symbols or SC-FDMA symbols forming a single slot
is seven. Each of elements of the resource grid is referred to as a
resource element. The resource element is identified by using a
subcarrier number and an OFDM symbol number or an SC-FDMA symbol number.

[0137] A resource block is used to express mapping of a certain physical
channel (a PDSCH, a PUSCH, or the like) to a resource element. The
resource block includes a virtual resource block and a physical resource
block. A certain physical channel is first mapped to the virtual resource
block. Then, the virtual resource block is mapped to the physical
resource block. A single physical resource block is defined by seven
continuous OFDM symbols or SC-FDMA symbols in the time domain, and twelve
contiguous subcarriers in the frequency domain. Therefore, a single
physical resource block is constituted by (7×12) resource elements.
In addition, a single physical resource block corresponds to a single
slot in the time domain and corresponds to 180 kHz in the frequency
domain. The physical resource block may be numbered from 0 in the
frequency domain.

[0138] Hereinafter, a description will be made of a physical channel and a
physical signal transmitted in each subframe.

[0139] FIG. 4 is a diagram illustrating an example of an arrangement of
physical channels and physical signals in a downlink subframe of the
present embodiment. In FIG. 4, a transverse axis is a time axis, and a
longitudinal axis is a frequency axis. The base station apparatus 3 may
transmit the downlink physical channels (the PBCH, the PCFICH, the PHICH,
the PDCCH, the EPDCCH, and the PDSCH) and the downlink physical signals
(the synchronization signal and the downlink reference signal) in the
downlink subframe. In addition, the PBCH is transmitted only in the
subframe 0 of the radio frame. Further, the downlink reference signal is
mapped in resource elements which are distributed in the frequency domain
and the time domain. For simplification of description, the downlink
reference signal is not illustrated in FIG. 4.

[0140] In a PDCCH region, a plurality of PDCCHs may be subject to
frequency and time multiplexing. In an EPDCCH region, a plurality of
EPDCCHs may be subject to frequency and time multiplexing. In a PDSCH
region, a plurality of PDSCHs may be subject to frequency and time
multiplexing. The PDCCH and the PDSCH or the EPDCCH may be subject to
time multiplexing. The PDSCH and the EPDCCH may be subject to frequency
multiplexing.

[0141] FIG. 5 is a diagram illustrating an example of an arrangement of
physical channels and physical signals in an uplink subframe of the
present embodiment. In FIG. 5, a transverse axis is a time axis, and a
longitudinal axis is a frequency axis. The mobile station apparatus 1 may
transmit the uplink physical channels (the PUCCH, the PUSCH, and the
PRACH) and the uplink physical signals (the DMRS and the SRS). In a PUCCH
region, a plurality of PUCCHs may be subject to frequency, time and code
multiplexing. In a PUSCH region, a plurality of PUSCHs may be subject to
frequency and spatial multiplexing in the uplink subframe. The PUCCH and
the PUSCH may be subject to frequency multiplexing. The PRACH may be
allocated in a single subframe or across two subframes. In addition, a
plurality of PRACHs may be subject to code multiplexing.

[0142] The SRS is transmitted by using the last SC-FDMA symbol of the
uplink subframe. In other words, the SRS is mapped in the last SC-FDMA
symbol of the uplink subframe. The mobile station apparatus 1 cannot
simultaneously transmit the SRS and the PUCCH/PUSCH/PRACH in a single
SC-FDMA symbol of a single cell.

[0143] In a single uplink subframe of a single cell, the mobile station
apparatus 1 can transmit the PUSCH and/or the PUCCH by using SC-FDMA
symbols excluding the last SC-FDMA symbol of the uplink subframe, and can
transmit the SRS by using the last SC-FDMA symbol of the uplink subframe.
In other words, in the single uplink subframe of the single cell, the
mobile station apparatus 1 can transmit both the SRS and the PUSCH/PUCCH.
In addition, the DMRS is subject to time multiplexing with the PUCCH or
the PUSCH. For simplification of description, the DMRS is not illustrated
in FIG. 5.

[0144] FIG. 6 is a diagram illustrating an example of an arrangement of
physical channels and physical signals in a special subframe of the
present embodiment. In FIG. 6, a transverse axis is a time axis, and a
longitudinal axis is a frequency axis. In FIG. 6, the DwPTs is
constituted by the first to tenth SC-FDMA symbols of the special
subframe, the GP is constituted by the eleventh and twelfth SC-FDMA
symbols of the special subframe, and the UpPTS is constituted by the
thirteenth and fourteenth SC-FDMA symbols of the special subframe.

[0145] The base station apparatus 3 may transmit the PCFICH, the PHICH,
the PDCCH, the EPDCCH, the PDSCH, the synchronization signal, and the
downlink reference signal in the DwPTS of the special subframe. The base
station apparatus 3 may not transmit the PBCH in the DwPTS of the special
subframe. The mobile station apparatus 1 may transmit the PRACH and the
SRS in the UpPTS of the special subframe. In other words, the mobile
station apparatus 1 does not transmit the PUCCH, the PUSCH, and the DMRS
in the UpPTS of the special subframe.

[0146] Hereinafter, a description will be made of the first uplink
reference UL-DL configuration, the first downlink reference UL-DL
configuration, the second uplink reference UL-DL configuration, the
second downlink reference UL-DL configuration, and the transmission
direction UL-DL configuration.

[0147] The first uplink reference UL-DL configuration, the first downlink
reference UL-DL configuration, the second uplink reference UL-DL
configuration, the second downlink reference UL-DL configuration, and the
transmission direction UL-DL configuration are defined by an
uplink-downlink configuration (UL-DL configuration).

[0148] The uplink-downlink configuration is a configuration related to a
pattern of subframes of a radio frame. The uplink-downlink configuration
indicates that each subframe of the radio frame is one of a downlink
subframe, an uplink subframe, and a special subframe.

[0149] In other words, the first uplink reference UL-DL configuration, the
first downlink reference UL-DL configuration, the second uplink reference
UL-DL configuration, the second downlink reference UL-DL configuration,
and the transmission direction UL-DL configuration are defined by
patterns of the downlink subframe, the uplink subframe, and the special
subframe of the radio frame.

[0150] The patterns of the downlink subframe, the uplink subframe, and the
special subframe are those each of subframes #0 to #9 and indicate any
one of the downlink subframe, the uplink subframe, and the special
subframe, and, preferably, each subframe is represented by any
combination in which D, U, and S (respectively indicating the downlink
subframe, the uplink subframe, and the special subframe) have a length of
10. More preferably, a leading subframe (that is, the subframe #0) is D,
and the second subframe (that is, the subframe #1) is S.

[0151] FIG. 7 is a table illustrating an example of an uplink-downlink
configuration in the present embodiment. In FIG. 7, D indicates a
downlink subframe, U indicates an uplink subframe, and S indicates a
special subframe.

[0152] In FIG. 7, a subframe 1 of the radio frame is a special subframe at
all times. In FIG. 7, subframes 0 to 5 are reserved for downlink
transmission at all times, and the subframe 1 is reserved for uplink
transmission at all times.

[0153] In FIG. 7, in a case where the downlink-to-uplink switch-point
periodicity is 5 ms, a subframe 6 of the radio frame is a special
subframe. In a case where the downlink-to-uplink switch-point periodicity
is 10 ms, the subframe 6 of the radio frame is a downlink subframe.

[0154] The first uplink reference UL-DL configuration is also referred to
as a first parameter, a first configuration, or a serving cell UL-DL
configuration. The first downlink reference UL-DL configuration is also
referred to as a second parameter or a second configuration. The second
uplink reference UL-DL configuration is also referred to as a third
parameter or a third configuration. The second downlink reference UL-DL
configuration is also referred to as a fourth parameter or a fourth
configuration. The transmission direction UL-DL configuration is also
referred to as a fifth parameter or a fifth configuration.

[0155] An uplink-downlink configuration i being set as the first or second
uplink reference UL-DL configuration is referred to as first or second
uplink reference UL-DL configuration i being set. An uplink-downlink
configuration i is being set as the first or second downlink reference
UL-DL configuration is referred to as first or second downlink reference
UL-DL configuration i being set. An uplink-downlink configuration i being
set as the transmission direction UL-DL configuration is referred to as a
transmission direction UL-DL configuration i being set.

[0156] Hereinafter, a description will be made of a method of setting the
first uplink reference UL-DL configuration, the first downlink reference
UL-DL configuration, and the transmission direction UL-DL configuration.

[0157] The base station apparatus 3 sets the first uplink reference UL-DL
configuration, the first downlink reference UL-DL configuration, and the
transmission direction UL-DL configuration. The base station apparatus 3
may transmit first information (TDD-Config) indicating the first uplink
reference UL-DL configuration, second information indicating the first
downlink reference UL-DL configuration, and third information indicating
the transmission direction UL-DL configuration, which include at least
one of an MIB, a system information block type 1 message, a system
information message, an RRC message, an MAC control element (CE), and
control information (for example, a DCI format) of a physical layer. In
addition, the base station apparatus 3 may include the first information,
the second information, and the third information in at least one of the
MIB, the system information block type 1 message, the system information
message, the RRC message, the MAC control element (CE), and the control
information (for example, a DCI format) of a physical layer, depending on
circumstances.

[0158] The first uplink reference UL-DL configuration, the first downlink
reference UL-DL configuration, the second uplink reference UL-DL
configuration, the second downlink reference UL-DL configuration, and the
transmission direction UL-DL configuration may be defined for each of a
plurality of serving cells.

[0159] The base station apparatus 3 transmits the first information, the
second information, and the third information for each serving cell, to
the mobile station apparatus 1 for which a plurality of serving cells are
set. In addition, the first information, the second information, and the
third information may be defined for each serving cell.

[0160] The base station apparatus 3 may transmit, to the mobile station
apparatus 1 for which two serving cells including a primary cell and a
secondary cell, the first information for the primary cell, the second
information for the primary cell, the third information for the primary
cell, the first information for a secondary cell, the second information
for the secondary cell, and the third information for the secondary cell.

[0161] The mobile station apparatus 1 for which the plurality of serving
cells are set may set the first uplink reference UL-DL configuration, the
first downlink reference UL-DL configuration, and the transmission
direction UL-DL configuration in each serving cell on the basis of the
first information, the second information, and the third information.

[0162] The mobile station apparatus 1 for which two serving cells
including a primary cell and a secondary cell are set may set the first
uplink reference UL-DL configuration for the primary cell, the first
downlink reference UL-DL configuration for the primary cell, and the
transmission direction UL-DL configuration the primary cell, the first
uplink reference UL-DL configuration for the secondary cell, the first
downlink reference UL-DL configuration for the secondary cell, and the
transmission direction DL-UL configuration for the secondary cell.

[0163] The first information for the primary cell is preferably included
in the system information block type 1 message, or the RRC message. The
first information for the secondary cell is preferably included in the
RRC message. The second information for the primary cell is preferably
included in the system information block type 1 message, the system
information message, or the RRC message. The second information for the
secondary cell is preferably included in the RRC message. The third
information is preferably included in the MIB, the MAC CE, or the control
information (for example, a DCI format) of a physical layer.

[0164] The first information is preferably common to a plurality of mobile
station apparatuses 1 in a cell. The second information may be common to
the plurality of mobile station apparatuses 1 in the cell, and may be
dedicated to the mobile station apparatus 1. The third information may be
common to the plurality of mobile station apparatuses 1 in the cell, and
may be dedicated to the mobile station apparatus 1.

[0165] The second information may be transmitted along with the first
information. The mobile station apparatus 1 in which the first downlink
reference UL-DL configuration is not set on the basis of the second
information may not receive the third information.

[0166] The periodicity of changing the transmission direction UL-DL
configuration is preferably shorter than the periodicity of changing the
downlink reference UL-DL configuration. A frequency of changing the
transmission direction UL-DL configuration is preferably lower than a
frequency of changing the downlink reference UL-DL configuration. The
periodicity of changing the downlink reference UL-DL configuration is
preferably shorter than the periodicity of changing the uplink reference
UL-DL configuration. A frequency of changing the downlink reference UL-DL
configuration is preferably lower than a frequency of changing the uplink
reference UL-DL configuration.

[0167] The system information block type 1 message is initially
transmitted in the subframe 5 of a radio frame satisfying SFN mod 8=0,
via a PDSCH, and undergoes retransmission (repetition) in the subframe 5
of another subframe satisfying SFN mod 2=0. The system information block
type 1 message includes information indicating a configuration (lengths
of a DwPTS, a GP, and a UpPTS) of a special subframe. The system
information block type 1 message is cell-specific information.

[0168] The system information message is transmitted via the PDSCH. The
system information message is cell-specific information. The system
information message includes system information blocks X other than the
system information block type 1 message.

[0169] The RRC message is transmitted via the PDSCH. The RRC message is
information/signal which is processed in an RRC layer. The RRC may be
common to a plurality of mobile station apparatuses 1 in a cell, and may
be dedicated to a specified mobile station apparatus 1.

[0170] The MAC CE is transmitted via the PDSCH. The MAC CE is
information/signal which is processed in an MAC layer.

[0171] In a case where an RRC message including the first information,
and/or the second information, and/or the third information are (is)
received via the PDSCH, the mobile station apparatus 1 preferably sets
(makes valid) the first uplink reference UL-DL configuration, and/or the
first downlink reference UL-DL configuration, and/or the transmission
direction UL-DL configuration in a subframe (timing) in which an RRC
connection reconfiguration completion message corresponding to the RRC
message is transmitted.

[0172] In a case where an MIB including the first information, and/or the
second information, and/or the third information is received via a PBCH
in a subframe n-k, the mobile station apparatus 1 preferably sets (makes
valid) the first uplink reference UL-DL configuration/the first downlink
reference UL-DL configuration, and/or the transmission direction UL-DL
configuration in a subframe n. For example, k is 4 or 8. For example, k
is determined on the basis of a table of FIG. 19 and the present first or
second downlink reference UL-DL configuration. FIG. 19 will be described
later.

[0173] In a case where an MAC CE including the first information, and/or
the second information, and/or the third information is received via a
PDSCH in a subframe n-k, the mobile station apparatus 1 preferably sets
(makes valid) the first uplink reference UL-DL configuration, and/or the
first downlink reference UL-DL configuration, and/or the transmission
direction UL-DL configuration in a subframe n. For example, k is 4 or 8.
For example, a subframe n+k is a subframe for transmitting a HARQ-ACK
(ACK) of the PDSCH which is used to transmit the MAC CE. For example, k
is determined on the basis of the table of FIG. 19 and the present first
or second downlink reference UL-DL configuration.

[0174] In a case where control information (for example, a DCI format) of
a physical layer including the first information, and/or the second
information, and/or the third information is received via a downlink
physical channel (for example, a PDCCH/EPDCCH) in a subframe n-k, the
mobile station apparatus 1 preferably sets (makes valid) the first uplink
reference UL-DL configuration, and/or the first downlink reference UL-DL
configuration, and/or the transmission direction UL-DL configuration in a
subframe n. For example, k is 4 or 8. For example, a subframe n+k is a
subframe for transmitting a HARQ-ACK (ACK) of the downlink physical
channel (for example, a PDCCH/EPDCCH) which is used to transmit the
control information (for example, a DCI format) of a physical layer. For
example, k is determined on the basis of the table of FIG. 19 and the
present first or second downlink reference UL-DL configuration.

[0175] In addition, the mobile station apparatus 1 which receives the
first information for a certain serving cell and does not receive the
second information for the certain serving cell, and the base station
apparatus 3 which transmits the first information for the certain serving
cell and does not transmit the second information for the certain cell
may set the first downlink reference UL-DL configuration for the certain
serving cell on the basis of the first information for the certain
serving cell. The mobile station apparatus 1 may disregard the third
information for the certain serving cell for which the first downlink
reference UL-DL configuration is set on the basis of the first
information.

[0176] FIG. 8 is a flowchart illustrating a method of setting the first
uplink reference UL-DL configuration and the first downlink reference
UL-DL configuration in the present embodiment. The mobile station
apparatus 1 performs the setting method illustrated in FIG. 8 on each of
a plurality of serving cells.

[0177] The mobile station apparatus 1 sets the first uplink reference
UL-DL configuration for a certain serving cell on the basis of the first
information (S1000). The mobile station apparatus 1 determines whether or
not the second information for the certain serving cell has been received
(S1002). If the second information for the certain serving cell has been
received, the mobile station apparatus 1 sets the first downlink
reference UL-DL configuration for the certain serving cell on the basis
of the second information for the certain serving cell (S1006). If the
second information for the certain serving cell has not been received
(else/otherwise), the mobile station apparatus 1 sets the first downlink
reference UL-DL configuration for the certain serving cell on the basis
of the first information for the certain serving cell (S1004).

[0178] A serving cell for which the first uplink reference UL-DL
configuration and the first downlink reference UL-DL configuration are
set on the basis of the first information is also referred to as a
serving cell for which dynamic TDD is not set. A serving cell for which
the first downlink reference UL-DL configuration is set on the basis of
the second information is also referred to as a serving cell for which
the dynamic TDD is set.

[0179] In a case where the first downlink reference UL-DL configuration is
reset for a serving cell for which the transmission direction UL-DL
configuration has been set, the mobile station apparatus 1 may
clear/discard the transmission direction UL-DL configuration for the
serving cell.

[0180] In addition, in a case where the first downlink reference UL-DL
configuration which is reset for a serving cell for which the
transmission direction UL-DL configuration has been set is the same as
the previous first downlink reference UL-DL configuration, the mobile
station apparatus 1 may not clear/discard the transmission direction
UL-DL configuration. In other words, in a case where the first downlink
reference UL-DL configuration for a serving cell for which the
transmission direction UL-DL configuration has been set is changed, the
mobile station apparatus 1 may clear/discard the transmission direction
UL-DL configuration for the serving cell.

[0181] In a case where the base station apparatus 3 instructs the mobile
station apparatus 1 to reset/change the first downlink reference UL-DL
configuration for a serving cell for which the transmission direction
UL-DL configuration has been set, it may be regarded that the
transmission direction UL-DL configuration for the serving cell is
cleared/discarded by the mobile station apparatus 1.

[0182] Further, in a case where the first uplink reference UL-DL
configuration for a serving cell for which the first downlink reference
UL-DL configuration and the transmission direction UL-DL configuration
have been set is reset, the mobile station apparatus 1 may clear/discard
the first downlink reference UL-DL configuration and the transmission
direction UL-DL configuration.

[0183] In a case where the base station apparatus 3 instructs the mobile
station apparatus 1 to reset/change the first uplink reference UL-DL
configuration for a serving cell for which the first downlink reference
UL-DL configuration and the transmission direction UL-DL configuration
have been set is reset, it may be regarded that the first downlink
reference UL-DL configuration and the transmission direction UL-DL
configuration may be cleared/discarded by the mobile station apparatus 1.

[0184] The mobile station apparatus 1 receives the second information,
determines a subframe in which an uplink signal can be transmitted on the
basis of the second information, and then monitors whether or not the
third information is received. If the third information is received, a
subframe is determined in which an uplink signal can be transmitted on
the basis of the third information.

[0185] For example, the base station apparatus 3 transmits the third
information to the mobile station apparatus 1 by using (a) PDCCH/EPDCCH.
The third information is used to control dynamic TDD operation in
coverage of the base station apparatus 3 (cell). The third information is
transmitted and received in a common search space (CSS) or a UE-specific
search space (USS).

[0186] The CSS is a space in which the plurality of mobile station
apparatuses 1 monitor (a) PDCCH/EPDCCH. The USS is a space which is
defined on the basis of at least a C-RNTI. The C-RNTI is an identifier
which is uniquely assigned to the mobile station apparatus 1.

[0187] The C-RNTI may be used to transmit a DCI format including the third
information (information indicating a transmission direction of a
subframe). An RNTI different from the C-RNTI and the SPS C-RNTI may be
used to transmit a DCI format including the third information
(information indicating a transmission direction of a subframe). The RNTI
is also referred to as an X-RNTI. In other words, a CRC parity bit added
to the DCI format including the third information is scrambled with the
C-RNTI or the X-RNTI.

[0188] In addition, a subframe may be restricted which is used for the
mobile station apparatus 1 to monitor the PDCCH/EPDCCH including the
third information. The base station apparatus 3 may control a subframe
which is used for the mobile station apparatus 1 to monitor the
PDCCH/EPDCCH including the third information. The base station apparatus
3 may transmit, to the mobile station apparatus 1, information indicating
the subframe used for the mobile station apparatus 1 to monitor the
PDCCH/EPDCCH including the third information.

[0189] For example, the PDCCH/EPDCCH including the third information may
be allocated at intervals of ten subframes. For example, the mobile
station apparatus 1 monitors the third information at intervals of ten
subframes. A subframe in which the PDCCH/EPDCCH including the third
information may be determined in advance. For example, the third
information may be mapped only in the subframe 0 or 5 of the radio frame.

[0190] The base station apparatus 3 transmits the third information only
in a case where it is determined that the third information is necessary.
For example, in a case where it is determined that the transmission
direction UL-DL configuration is changed, the base station apparatus 3
transmits the third information. For example, in a case where it is
determined that the mobile station apparatus 1 which starts a dynamic TDD
operation is required to be notified of the third information, the base
station apparatus 3 transmits the third information thereto.

[0191] The mobile station apparatus 1 which starts the dynamic TDD
operation monitors the PDCCH/EPDCCH including the third information in a
subframe in which the PDCCH/EPDCCH including the third information is
allocated.

[0192] The mobile station apparatus 1 may monitor the third information
only in a case where the mobile station apparatus is set to monitor the
third information. For example, the mobile station apparatus 1 may
monitor the third information only in a case where the first downlink
reference configuration is set.

[0193] The mobile station apparatus 1 tries to decode a received signal
and determines whether or not the PDCCH/EPDCCH including the third
information is detected. In a case where the PDCCH/EPDCCH including the
third information is detected, the mobile station apparatus 1 determines
a subframe in which an uplink signal can be transmitted on the basis of
the detected third information. In a case where the PDCCH/EPDCCH
including the third information is not detected, the mobile station
apparatus 1 may maintain a determination hitherto regarding a subframe in
which an uplink signal can be transmitted.

[0194] Hereinafter, a description will be made of a method of setting the
second uplink reference UL-DL configuration.

[0195] In a case where a plurality of serving cells are set for the mobile
station apparatus 1, and the first uplink reference UL-DL configurations
for at least two serving cells are different from each other, the mobile
station apparatus 1 and the base station apparatus 3 set the second
uplink reference UL-DL configuration.

[0196] Except for the case where a plurality of serving cells are set for
the mobile station apparatus 1, and the first uplink reference UL-DL
configurations for at least two serving cells are different from each
other, the mobile station apparatus 1 and the base station apparatus 3
may not set the second uplink reference UL-DL configuration.

[0197] A case excluding the case where the first uplink reference UL-DL
configurations for at least two serving cells are different from each
other is a case where the first uplink reference UL-DL configurations for
all the serving cells are the same as each other. In a case where a
single serving cell is set for the mobile station apparatus 1, the mobile
station apparatus 1 and the base station apparatus 3 may not set the
second uplink reference UL-DL configuration.

[0198] FIG. 9 is a flowchart illustrating a method of setting the second
uplink reference UL-DL configuration in the present embodiment. In FIG.
9, a single primary cell and a single secondary cell are set for the
mobile station apparatus 1. The mobile station apparatus 1 performs the
setting method illustrated in FIG. 9 on each of the primary cell and the
secondary cell.

[0199] The mobile station apparatus 1 determines whether or not the first
uplink reference UL-DL configuration for the primary cell and the first
uplink reference UL-DL configuration for the secondary cell are different
from each other (S1100). If the first uplink reference UL-DL
configuration for the primary cell and the first uplink reference UL-DL
configuration for the secondary cell are the same as each other, the
mobile station apparatus 1 does not set the second uplink reference UL-DL
configuration, and finishes the setting process of the second uplink
reference UL-DL configuration.

[0200] If the first uplink reference UL-DL configuration for the primary
cell and the first uplink reference UL-DL configuration for the secondary
cell are different from each other, the mobile station apparatus 1
determines whether a serving cell is the primary cell or the secondary
cell, and/or whether or not the mobile station apparatus is set to
monitor (a) PDCCH/EPDCCH including a carrier indicator field (CIF) so as
to correspond to the serving cell in the other serving cell (S1102).

[0201] If the serving cell is the secondary cell, and the mobile station
apparatus is set to monitor the PDCCH/EPDCCH including the CIF so as to
correspond to the serving cell (secondary cell) in the other serving cell
(primary cell), the mobile station apparatus 1 sets the second uplink
reference UL-DL configuration for the serving cell (secondary cell) on
the basis of a pair formed by the first uplink reference UL-DL
configuration for the other serving cell (primary cell) and the first
uplink reference UL-DL configuration for the serving cell (secondary
cell) (S1104).

[0202] In S1104, the mobile station apparatus 1 sets the second uplink
reference UL-DL configuration for the serving cell (secondary cell) on
the basis of a table of FIG. 10. FIG. 10 is a diagram illustrating a
correspondence between the pair formed by the first uplink reference
UL-DL configuration for the other serving cell (primary cell) and the
first uplink reference UL-DL configuration for the serving cell
(secondary cell), and the second uplink reference UL-DL configuration for
the secondary cell.

[0203] In FIG. 10, a primary cell UL-DL configuration is set by referring
to the first uplink reference UL-DL configuration for the other serving
cell (primary cell). In FIG. 10, a secondary cell UL-DL configuration is
set by referring to the first uplink reference UL-DL configuration for
the serving cell (secondary cell).

[0204] For example, in a case where the first uplink reference UL-DL
configuration 0 is set for the other serving cell (primary cell), and the
first uplink reference UL-DL configuration 2 is set for the serving cell
(secondary cell), the second uplink reference UL-DL configuration 1 is
set for the secondary cell.

[0205] If the serving cell is primary cell, or the serving cell is the
secondary cell and the mobile station apparatus 1 is not set to monitor
the PDCCH/EPDCCH including the CIF so as to correspond to the serving
cell (secondary cell) in the other serving cell (primary cell), the
mobile station apparatus sets the first uplink reference UL-DL
configuration for the serving cell as the second uplink reference UL-DL
configuration for the serving cell (S1106).

[0206] The base station apparatus 3 sets the second uplink reference UL-DL
configuration on the basis of the setting method illustrated in FIG. 9.

[0207] Monitoring the PDCCH/EPDCCH including the CIF indicates trying to
decode the PDCCH or the EPDCCH according to a DCI format including the
CIF. The CIF is a field to which a carrier indicator is mapped. A value
of the carrier indicator indicates a serving cell corresponding to a DCI
format to which the carrier indicator is related.

[0208] The mobile station apparatus 1 which is set to monitor the
PDCCH/EPDCCH including the CIF so as to correspond to the serving cell in
the other serving cell monitors the PDCCH/EPDCCH including the CIF in the
other serving cell.

[0209] The mobile station apparatus 1 which is set to monitor the
PDCCH/EPDCCH including the CIF so as to correspond to the serving cell in
the other serving cell preferably receives the third information for the
serving cell via the PDCCH/EPDCCH.

[0210] The mobile station apparatus 1 which is not set to monitor the
PDCCH/EPDCCH including the CIF so as to correspond to the serving cell in
the other serving cell monitors the PDCCH/EPDCCH including the CIF or not
including the CIF in the serving cell.

[0211] The mobile station apparatus 1 which is not set to monitor the
PDCCH/EPDCCH including the CIF so as to correspond to the serving cell in
the other serving cell preferably receives the third information for the
serving cell via the PDCCH/EPDCCH.

[0212] The PDCCH/EPDCCH for the primary cell is transmitted in the primary
cell. The third information for the primary cell is preferably
transmitted via the PDCCH/EPDCCH of the primary cell.

[0213] The base station apparatus 3 transmits, to the mobile station
apparatus 1, a parameter (cif-Presence-r10) indicating whether or not the
CIF is included in a DCI format transmitted in the primary cell.

[0214] The base station apparatus 3 transmits, to the mobile station
apparatus 1, a parameter (CrossCarrierSchedulingConfig-r10) related to
cross carrier scheduling for each secondary cell.

[0215] The parameter (CrossCarrierSchedulingConfig-r10) includes a
parameter (schedulingCellInfo-r10) indicating whether (a) PDCCH/EPDCCH
corresponding to a related secondary cell is transmitted in the secondary
cell or in the other serving cells.

[0216] In a case where the parameter (schedulingCellInfo-r10) indicates
that the PDCCH/EPDCCH corresponding to a related secondary cell is
transmitted in the secondary cell, the parameter (schedulingCellInfo-r10)
includes a parameter (cif-Presence-r10) indicating whether or not the CIF
is included in a DCI format transmitted in the secondary cell.

[0217] In a case where the parameter (schedulingCellInfo-r10) indicating
that PDCCH/EPDCCH corresponding to a related secondary cell is
transmitted in the other serving cells, the parameter
(schedulingCellInfo-r10) includes a parameter (schedulingCellId)
indicating to which serving cell a downlink assignment for the related
secondary cell is sent.

[0218] Hereinafter, a description will be made of a method of setting the
second downlink reference UL-DL configuration.

[0219] In a case where a plurality of serving cells are set for the mobile
station apparatus 1, and the first downlink reference UL-DL
configurations for at least two serving cells are different from each
other, the mobile station apparatus 1 and the base station apparatus 3
set the second downlink reference UL-DL configuration. Except for the
case where a plurality of serving cells are set for the mobile station
apparatus 1, and the first downlink reference UL-DL configurations for at
least two serving cells are different from each other, the mobile station
apparatus 1 and the base station apparatus 3 may not set the second
downlink reference UL-DL configuration.

[0220] A case excluding the case where the first downlink reference UL-DL
configurations for at least two serving cells are different from each
other is a case where the first downlink reference UL-DL configurations
for all the serving cells are the same as each other. In a case where a
single serving cell is set for the mobile station apparatus 1, the mobile
station apparatus 1 and the base station apparatus 3 may not set the
second downlink reference UL-DL configuration.

[0221] FIG. 11 is a flowchart illustrating a method of setting the second
downlink reference UL-DL configuration in the present embodiment. In FIG.
11, a single primary cell and a single secondary cell are set for the
mobile station apparatus 1. The mobile station apparatus 1 performs the
setting method illustrated in FIG. 11 on each of the primary cell and the
secondary cell.

[0222] The mobile station apparatus 1 determines whether or not the first
downlink reference UL-DL configuration for the primary cell and the first
downlink reference UL-DL configuration for the secondary cell are
different from each other (S1300). If the first downlink reference UL-DL
configuration for the primary cell and the first downlink reference UL-DL
configuration for the secondary cell are the same as each other, the
mobile station apparatus 1 does not the second downlink reference UL-DL
configuration, and finishes the setting process of the second downlink
reference UL-DL configuration.

[0223] If the first downlink reference UL-DL configuration for the primary
cell and the first downlink reference UL-DL configuration for the
secondary cell are different from each other, the mobile station
apparatus 1 determines whether a serving cell is the primary cell or the
secondary cell (S1302).

[0224] If the serving cell is the secondary cell, the mobile station
apparatus 1 sets the second uplink reference UL-DL configuration for the
serving cell (secondary cell) on the basis of a pair formed by the first
downlink reference UL-DL configuration for the other serving cell
(primary cell) and the first downlink reference UL-DL configuration for
the serving cell (secondary cell) (S1304).

[0225] In S1304, the mobile station apparatus 1 sets the second downlink
reference UL-DL configuration for the serving cell (secondary cell) on
the basis of a table of FIG. 12. FIG. 12 is a diagram illustrating a
correspondence between the pair formed by the first downlink reference
UL-DL configuration for the primary cell and the first downlink reference
UL-DL configuration for the secondary cell, and the second downlink
reference UL-DL configuration for the secondary cell.

[0226] In FIG. 12, a primary cell UL-DL configuration is set by referring
to the first downlink reference UL-DL configuration for the primary cell.
In FIG. 12, a secondary cell UL-DL configuration is set by referring to
the first downlink reference UL-DL configuration for the secondary cell.

[0227] In a case where the pair formed by the first downlink reference
UL-DL configuration for the primary cell and the first downlink reference
UL-DL configuration for the secondary cell belongs to a set 1 of FIG. 12,
the second downlink reference UL-DL configuration for the secondary cell
is defined in the set 1.

[0228] In a case where the mobile station apparatus 1 is not set to
monitor (a) PDCCH/EPDCCH including the CIF so as to correspond to the
secondary cell in the primary cell, and the pair formed by the first
downlink reference UL-DL configuration for the primary cell and the first
downlink reference UL-DL configuration for the secondary cell belongs to
a set 2 of FIG. 12, the second downlink reference UL-DL configuration for
the secondary cell is defined in the set 2.

[0229] In a case where the mobile station apparatus 1 is not set to
monitor the PDCCH/EPDCCH including the CIF so as to correspond to the
secondary cell in the primary cell, and the pair formed by the first
downlink reference UL-DL configuration for the primary cell and the first
downlink reference UL-DL configuration for the secondary cell belongs to
a set 3 of FIG. 12, the second downlink reference UL-DL configuration for
the secondary cell is defined in the set 3.

[0230] In a case where the mobile station apparatus 1 is set to monitor
the PDCCH/EPDCCH including the CIF so as to correspond to the secondary
cell in the primary cell, and the pair formed by the first downlink
reference UL-DL configuration for the primary cell and the first downlink
reference UL-DL configuration for the secondary cell belongs to a set 4
of FIG. 12, the second downlink reference UL-DL configuration for the
secondary cell is defined in the set 4.

[0231] In a case where the mobile station apparatus 1 is set to monitor
the PDCCH/EPDCCH including the CIF so as to correspond to the secondary
cell in the primary cell, and the pair formed by the first downlink
reference UL-DL configuration for the primary cell and the first downlink
reference UL-DL configuration for the secondary cell belongs to a set 5
of FIG. 12, the second downlink reference UL-DL configuration for the
secondary cell is defined in the set 5.

[0232] For example, in a case where the first downlink reference UL-DL
configuration 1 is set for the primary cell, and the first downlink
reference UL-DL configuration 0 is set for the secondary cell, the second
downlink reference UL-DL configuration 0 is set for the secondary cell.

[0233] If the serving cell is primary cell, the mobile station apparatus
sets the first downlink reference UL-DL configuration for the serving
cell (primary cell) as the second uplink reference UL-DL configuration
for the serving cell (primary cell) (S1306).

[0234] In addition, the base station apparatus 3 the second downlink
reference UL-DL configuration on the basis of the setting method
illustrated in FIG. 11.

[0235] Hereinafter, the first uplink reference UL-DL configuration will be
described.

[0236] The first uplink reference UL-DL configuration is at least used to
specify a subframe in which uplink transmission can or not be performed
in a serving cell.

[0237] The mobile station apparatus 1 does not uplink transmission in a
subframe which is indicated as a downlink subframe by the first uplink
reference UL-DL configuration. The mobile station apparatus 1 does not
uplink transmission in a DwPTS and a GP of a subframe which is indicated
as a special subframe by the first uplink reference UL-DL configuration.

[0238] Hereinafter, the first downlink reference UL-DL configuration will
be described.

[0239] The first downlink reference UL-DL configuration is at least used
to specify a subframe in which downlink transmission can be performed or
cannot be performed in a serving cell.

[0240] The mobile station apparatus 1 does not downlink transmission in a
subframe which is indicated as an uplink subframe by the first downlink
reference UL-DL configuration. The mobile station apparatus 1 does not
downlink transmission in a UpPTS and a GP of a subframe which is
indicated as a special subframe by the first downlink reference UL-DL
configuration.

[0241] The mobile station apparatus 1 which sets the first downlink
reference UL-DL configuration on the basis of the first information may
perform a measurement (for example, a measurement regarding channel state
information) using a downlink signal in a downlink subframe or a DwPTS of
a special subframe which is indicated by the first uplink reference UL-DL
configuration or the first downlink reference UL-DL configuration.

[0242] Therefore, in the dynamic TDD, if the base station apparatus 3 uses
a subframe which is indicated as a downlink subframe by the first uplink
reference UL-DL configuration, as an uplink subframe or a special
subframe, or uses a subframe which is indicated as a special subframe by
the first uplink reference UL-DL configuration, as an uplink subframe,
there is a problem in that the mobile station apparatus 1 in which the
first downlink reference UL-DL configuration on the basis of the first
information cannot appropriately perform the measurement using a downlink
signal.

[0243] Thus, the base station apparatus 3 determines a downlink reference
UL-DL configuration from a configuration set (configurations of the set)
which are restricted on the basis of the first uplink reference UL-DL
configuration. In other words, the first downlink reference UL-DL
configuration is an element of the configuration set which is restricted
on the basis of the first uplink reference UL-DL configuration. The
configuration set restricted on the basis of the first uplink reference
UL-DL configuration includes uplink reference UL-DL configurations which
satisfy the following conditions (a) to (c). FIG. 15 is a diagram
relationship between a subframe indicated by the first uplink reference
UL-DL configuration and a subframe indicated by the first downlink
reference UL-DL configuration. In FIG. 15, D indicates a downlink
subframe, U indicates an uplink subframe, and S indicates a special
subframe.

[0244] Condition (a): a subframe which is indicated as a
downlink subframe by the first uplink reference UL-DL configuration is
indicated as a downlink subframe.

[0245] Condition (b): a subframe which
is indicated as an uplink subframe by the first uplink reference UL-DL
configuration is indicated as an uplink subframe or a downlink subframe.

[0246] Condition (c): a subframe which is indicated as a special subframe
by the first uplink reference UL-DL configuration is indicated as a
downlink subframe or a special subframe.

[0247] Consequently, in the dynamic TDD, since a subframe which is
indicated as a downlink subframe by the first uplink reference UL-DL
configuration, and a DwPTS of a special subframe are not used for uplink
transmission, the mobile station apparatus 1 which sets the first
downlink reference UL-DL configuration on the basis of the first
information can appropriately perform a measurement using a downlink
signal.

[0248] In addition, the mobile station apparatus 1 which sets the first
downlink reference UL-DL configuration on the basis of the second
information may also perform a measurement (for example, a measurement
regarding channel state information) using a downlink signal in a
downlink subframe or a DwPTS of a special subframe indicated by the first
uplink reference UL-DL configuration.

[0249] A subframe which is indicated as an uplink subframe by the first
uplink reference UL-DL configuration and is indicated as a downlink
subframe by the first downlink reference UL-DL configuration is also
referred to as a first flexible subframe. The first flexible subframe is
a subframe which is reserved for uplink and downlink transmission.

[0250] A subframe which is indicated as a special subframe by the first
uplink reference UL-DL configuration and is indicated as a downlink
subframe by the first downlink reference UL-DL configuration is also
referred to as a second flexible subframe. The second flexible subframe
is a subframe which is reserved for downlink transmission. The second
flexible subframe is a subframe which is reserved for downlink
transmission in a DwPTS and uplink transmission in a UpPTS.

[0251] Hereinafter, the transmission direction UL-DL configuration will be
described in detail.

[0252] If the mobile station apparatus 1 determines a transmission
direction (up/down) on the basis of the first uplink reference UL-DL
configuration, the first downlink reference UL-DL configuration, and
scheduling information (a DCI format and/or a HARQ-ACK), there is a
problem in that the mobile station apparatus 1 which wrongly
receives/decodes the scheduling information (a DCI format and/or a
HARQ-ACK) transmits an uplink signal in a subframe in which the base
station apparatus 3 transmits a downlink signal to other mobile station
apparatuses 1, and thus the uplink signal interferes with the downlink
signal.

[0253] Therefore, the mobile station apparatus 1 and the base station
apparatus 3 of the present invention sets the transmission direction
UL-DL configuration regarding a transmission direction (up/down) in a
subframe. The transmission direction UL-DL configuration is used to
determine a transmission direction in a subframe.

[0254] The mobile station apparatus 1 controls transmission in the first
flexible subframe and the second flexible subframe on the basis of the
scheduling information (a DCI format and/or a HARQ-ACK) and the
transmission direction UL-DL configuration.

[0255] The base station apparatus 3 transmits the third information
indicating the transmission direction UL-DL configuration to the mobile
station apparatus 1. The third information is information indicating a
subframe in which uplink transmission can be performed. The third
information is information indicating a subframe in which downlink
transmission can be performed. The third information is information
indicating a subframe in which uplink transmission in the UpPTS and
downlink transmission in the DwPTS can be performed.

[0256] For example, the transmission direction UL-DL configuration is used
to specify a transmission direction in a subframe which is indicated as
an uplink subframe by the first uplink reference UL-DL configuration and
is indicated as a downlink subframe by the first downlink reference UL-DL
configuration, and/or a subframe which is indicated as a special subframe
by the first uplink reference UL-DL configuration and is indicated as a
downlink subframe by the first downlink reference UL-DL configuration. In
other words, the transmission direction UL-DL configuration is used to
specify a transmission direction in a subframe which is indicated as a
subframe different from a subframe which is indicated by the first uplink
reference UL-DL configuration and the first downlink reference UL-DL
configuration.

[0257] FIG. 14 is a diagram illustrating a relationship between a subframe
indicated by the first uplink reference UL-DL configuration, a subframe
indicated by the first downlink reference UL-DL configuration, and a
subframe indicated by the transmission direction UL-DL configuration in
the present embodiment. In FIG. 14, D indicates a downlink subframe, U
indicates an uplink subframe, and S indicates a special subframe.

[0258] The base station apparatus 3 determines the transmission direction
UL-DL configuration from a configuration set (configurations of the set)
which is restricted on the basis of the first uplink reference UL-DL
configuration and the first downlink reference UL-DL configuration. In
other words, the transmission direction UL-DL configuration is an element
of the configuration set which is restricted on the basis of the first
uplink reference UL-DL configuration and the first downlink reference
UL-DL configuration. The configuration set which is restricted on the
basis of the first uplink reference UL-DL configuration and the first
downlink reference UL-DL configuration includes UL-DL configurations
which satisfy the following conditions (d) to (h).

[0259] Condition
(d): a subframe which is indicated as a downlink subframe by the first
uplink reference UL-DL configuration and the first downlink reference
UL-DL configuration is indicated as a downlink subframe.

[0260] Condition
(e): a subframe which is indicated as an uplink subframe by the first
uplink reference UL-DL configuration and the first downlink reference
UL-DL configuration is indicated as an uplink subframe.

[0261] Condition
(f): a subframe which is indicated as an uplink subframe by the first
uplink reference UL-DL configuration but is indicated as a downlink
subframe by the first downlink reference UL-DL configuration is indicated
as an uplink subframe or a downlink subframe.

[0262] Condition (g): a
subframe which is indicated as a special subframe by the first uplink
reference UL-DL configuration and the first downlink reference UL-DL
configuration is indicated as a special subframe.

[0263] Condition (h): a
subframe which is indicated as a special subframe by the first uplink
reference UL-DL configuration but is indicated as a downlink subframe by
the first downlink reference UL-DL configuration is indicated as a
special subframe or a downlink subframe.

[0264] The base station apparatus 3 may perform scheduling of downlink
transmission in a subframe which is indicated as a downlink subframe by
the transmission direction UL-DL configuration.

[0265] The mobile station apparatus 1 may perform a reception process of a
downlink signal in a subframe which is indicated as a downlink subframe
by the transmission direction UL-DL configuration. The mobile station
apparatus 1 may perform monitoring of the PDCCH/EPDCCH in a subframe
which is indicated as a downlink subframe by the transmission direction
UL-DL configuration. The mobile station apparatus 1 may perform a
reception process of a PDSCH in a subframe which is indicated as a
downlink subframe by the transmission direction UL-DL configuration on
the basis of detection of a downlink grant using the PDCCH/EPDCCH.

[0266] In a case where transmission of an uplink signal (PUSCH/SRS) in a
subframe indicated as a downlink subframe by the transmission direction
UL-DL configuration is scheduled or set, the mobile station apparatus 1
does not perform a transmission process of the uplink signal (PUSCH/SRS)
in the subframe.

[0267] The base station apparatus 3 may perform scheduling of uplink
transmission in a subframe which is indicated as an uplink subframe by
the transmission direction UL-DL configuration.

[0268] The base station apparatus 3 may perform scheduling of downlink
transmission in a subframe which is indicated as an uplink subframe by
the transmission direction UL-DL configuration. The base station
apparatus 3 may be prohibited from performing scheduling of downlink
transmission in a subframe which is indicated as an uplink subframe by
the transmission direction UL-DL configuration.

[0269] The mobile station apparatus 1 may perform a transmission process
of an uplink signal in a subframe which is indicated as an uplink
subframe by the transmission direction UL-DL configuration. In a case
where transmission of an uplink signal (PUSCH/DMRS/SRS) in a subframe
indicated as an uplink subframe by the transmission direction UL-DL
configuration is scheduled or set, the mobile station apparatus 1 may
perform a transmission process of the uplink signal (PUSCH/DMRS/SRS) in
the subframe.

[0270] The mobile station apparatus 1 may perform a reception process of a
downlink signal in a subframe which is indicated as an uplink subframe by
the transmission direction UL-DL configuration and in which uplink
transmission is not scheduled. The mobile station apparatus 1 may be
prohibited from performing a reception process of a downlink signal in a
subframe which is indicated as an uplink subframe by the transmission
direction UL-DL configuration.

[0271] The base station apparatus 3 performs scheduling of downlink
transmission in a DwPTS of subframe which is indicated as a special
subframe by the transmission direction UL-DL configuration.

[0272] The mobile station apparatus 1 may perform a reception process of a
downlink signal in a DwPTS of a subframe which is indicated as a special
subframe by the transmission direction UL-DL configuration. The mobile
station apparatus 1 may perform monitoring of the PDCCH/EPDCCH in a DwPTS
of a subframe which is indicated as a special subframe by the
transmission direction UL-DL configuration. The mobile station apparatus
1 may perform a reception process of a PDSCH in a DwPTS of a subframe
which is indicated as a special subframe by the transmission direction
UL-DL configuration on the basis of detection of a downlink grant using
the PDCCH/EPDCCH.

[0273] In a case where transmission of a PUSCH in a subframe indicated as
a special subframe by the transmission direction UL-DL configuration is
scheduled or set, the mobile station apparatus 1 does not perform a
transmission process of the PUSCH in the subframe.

[0274] In a case where transmission of an SRS in a UpPTS of a subframe
indicated as a special subframe by the transmission direction UL-DL
configuration is scheduled or set, the mobile station apparatus 1 may
perform a transmission process of the SRS in the UpPTS of the subframe.

[0275] FIG. 15 is a diagram illustrating a relationship between the first
uplink reference UL-DL configuration, the first downlink reference UL-DL
configuration, and the transmission direction UL-DL configuration.

[0276] For example, in FIG. 15, in a case where the first uplink reference
UL-DL configuration is 0, the first downlink reference UL-DL
configuration is one of a set {0, 1, 2, 3, 4, 5, 6}. For example, in FIG.
15, in a case where the first uplink reference UL-DL configuration is 1,
the first downlink reference UL-DL configuration is one of a set {1, 2,
4, 5}.

[0277] For example, in FIG. 15, in a case where the first uplink reference
UL-DL configuration is 0, and the first downlink reference UL-DL
configuration is 1, the transmission direction UL-DL configuration is one
of a set {0, 1, 6}.

[0278] In addition, a value of the first downlink reference UL-DL
configuration may be the same as a value of the first uplink reference
UL-DL configuration. However, in order for the mobile station apparatus 1
which has not received the second information to set the same value as a
value of the first uplink reference UL-DL configuration as the first
downlink reference UL-DL configuration, a value of the first downlink
reference UL-DL configuration indicated by the second information is not
preferably the same as a value of the first uplink reference UL-DL
configuration indicated by the first information.

[0279] In a case where a value of the first uplink reference UL-DL
configuration is the same as a value of the first downlink reference
UL-DL configuration, the transmission direction UL-DL configuration may
not be defined. Alternatively, in a case where a value of the first
uplink reference UL-DL configuration is the same as a value of the first
downlink reference UL-DL configuration, the same value as the value of
the first uplink reference UL-DL configuration and the value of the first
downlink reference UL-DL configuration may be set as the transmission
direction UL-DL configuration.

[0280] In addition, as a configuration set which is restricted on the
basis of the first uplink reference UL-DL configuration and the first
downlink reference UL-DL configuration, a configuration set
(configurations of the set) which is constituted by UL-DL configurations
of the first uplink reference UL-DL configuration and UL-DL
configurations of the first downlink reference UL-DL configuration may be
used.

[0281] For example, in a case where the first uplink reference UL-DL
configuration is 0, and the first downlink reference UL-DL configuration
is 1, a configuration set which is restricted on the basis of the first
uplink reference UL-DL configuration and the first downlink reference
UL-DL configuration is {0, 1}. In this case, the third information
preferably has 1 bit.

[0282] The third information may be information indicating the
transmission direction UL-DL configuration (configurations of the set)
from the configuration set constituted by the first uplink reference
UL-DL configuration and the first downlink reference UL-DL configuration.

[0283] Hereinafter, the first uplink reference UL-DL configuration and the
second uplink reference UL-DL configuration will be described in detail.

[0284] The first uplink reference UL-DL configuration and the second
uplink reference UL-DL configuration are used to specify (select,
determine) a correspondence between a subframe n in which the
PDCCH/EPDCCH/PHICH is allocated and a subframe n+k in which the PUSCH
corresponding to the PDCCH/EPDCCH/PHICH is allocated.

[0285] In a case where a single primary cell is set, or in a case where a
single primary cell and a single secondary cell are set, and the first
uplink reference UL-DL configuration for the primary cell is the same as
the first uplink reference UL-DL configuration for the secondary cell, a
corresponding first uplink reference UL-DL configuration is used to
determine a correspondence between a subframe in which the
PDCCH/EPDCCH/PHICH is allocated and a subframe in which the PUSCH
corresponding to the PDCCH/EPDCCH/PHICH is allocated in each of the two
serving cells.

[0286] In a case where a single primary cell and a single secondary cell
are set, and the first uplink reference UL-DL configuration for the
primary cell is different from the first uplink reference UL-DL
configuration for the secondary cell, a corresponding second uplink
reference UL-DL configuration is used to determine a correspondence
between a subframe in which the PDCCH/EPDCCH/PHICH is allocated and a
subframe in which the PUSCH corresponding to the PDCCH/EPDCCH/PHICH is
allocated in each of the two serving cells.

[0287] FIG. 16 is a diagram illustrating a correspondence between the
subframe n in which the PDCCH/EPDCCH/PHICH is allocated and the PUSCH
corresponding to the PDCCH/EPDCCH/PHICH is allocated in the present
embodiment. The mobile station apparatus 1 specifies (selects,
determines) a value of k on the basis of a table of FIG. 16.

[0288] In FIG. 16, in a case where a single primary cell is set, or in a
case where a single primary cell and a single secondary cell are set, and
the first uplink reference UL-DL configuration for the primary cell is
the same as the first uplink reference UL-DL configuration for the
secondary cell, an uplink-downlink configuration is set by referring to
the first uplink reference UL-DL configuration.

[0289] In FIG. 16, in a case where a single primary cell and a single
secondary cell are set, and the first uplink reference UL-DL
configuration for the primary cell is different from the first uplink
reference UL-DL configuration for the secondary cell, an uplink-downlink
configuration is set by referring to the second uplink reference UL-DL
configuration.

[0290] Hereinafter, in description of FIG. 16, the first uplink reference
UL-DL configuration and the second uplink reference UL-DL configuration
are simply referred to as an uplink-downlink configuration.

[0291] In a case where the mobile station apparatus 1 detects the
PDCCH/EPDCCH and including an uplink grant which corresponds to a serving
cell for which uplink-downlink configurations of 1 to 6 and targets the
mobile station apparatus 1 in the subframe n, the PUSCH corresponding to
the uplink grant is transmitted in the subframe n+k which is specified
(selected, determined) on the basis of the table of FIG. 16.

[0292] In a case where the mobile station apparatus 1 detects the PHICH
including a NACK which corresponds to a serving cell for which
uplink-downlink configurations of 1 to 6 and targets the mobile station
apparatus 1 in the subframe n, the PUSCH corresponding to the uplink
grant is transmitted in the subframe n+k which is specified (selected,
determined) on the basis of the table of FIG. 16.

[0293] An uplink grant which corresponds to a serving cell for which the
uplink-downlink configuration 0 is set and targets the mobile station
apparatus 1 includes a 2-bit uplink index (UL index). An uplink grant
corresponds to a serving cell for which the uplink-downlink
configurations 1 to 5 are set and targets the mobile station apparatus 1
does not include the uplink index (UL index).

[0294] In a case where 1 is set to a most significant bit (MSB) of an
uplink index included in the uplink grant corresponding to a serving cell
for which the uplink-downlink configuration 0 is set in the subframe n,
the mobile station apparatus 1 adjusts transmission of the PUSCH
corresponding to the uplink grant in the subframe n+k which is specified
(selected, determined) on the basis of the table of FIG. 16.

[0295] In a case where the mobile station apparatus 1 receives a PHICH
including the NACK corresponding to a serving cell for which the
uplink-downlink configuration 0 is set in a first resource set of the
subframe n=0 or 5, the mobile station apparatus 1 adjusts transmission of
the PUSCH corresponding to the PHICH in the subframe n+k which is
specified (selected, determined) on the basis of the table of FIG. 16.

[0296] In a case where 1 is set to a least significant bit (LSB) of an
uplink index included in the uplink grant corresponding to a serving cell
for which the uplink-downlink configuration 0 is set in the subframe n,
the mobile station apparatus 1 adjusts transmission of the PUSCH
corresponding to the uplink grant in the subframe n+7.

[0297] In a case where the mobile station apparatus 1 receives a PHICH
including the NACK corresponding to a serving cell for which the
uplink-downlink configuration 0 is set in a second resource set of the
subframe n=0 or 5, the mobile station apparatus 1 adjusts transmission of
the PUSCH corresponding to the uplink grant in the subframe n+7.

[0298] In a case where the mobile station apparatus 1 receives a PHICH
including the NACK corresponding to a serving cell for which the
uplink-downlink configuration 0 is set in the subframe n=1 or 5, the
mobile station apparatus 1 adjusts transmission of the PUSCH
corresponding to the uplink grant in the subframe n+7.

[0299] For example, in a case where the mobile station apparatus 1 detects
a PDCCH, an EPDCCH, or a PHICH corresponding to a serving cell for which
the uplink-downlink configuration 0 is set in [SFN=m, subframe 1], the
mobile station apparatus adjusts transmission of the PUSCH in [SFN=m,
subframe 7] which is six subframes later than the subframe.

[0300] The first uplink reference UL-DL configuration and the second
uplink reference UL-DL configuration are used to specify (select,
determine) a correspondence between the subframe n in which the PHICH is
allocated and the subframe n-k in which the PUSCH corresponding to the
PHICH is allocated.

[0301] In a case where a single primary cell is set, or in a case where a
single primary cell and a single secondary cell are set, and the first
uplink reference UL-DL configuration for the primary cell is the same as
the first uplink reference UL-DL configuration for the secondary cell, a
corresponding first uplink reference UL-DL configuration is used to
specify (select, determine) a correspondence between the subframe n in
which the PHICH is allocated and the subframe n-k in which the PUSCH
corresponding to the PHICH is allocated in each of the two serving cells.

[0302] In a case where a single primary cell and a single secondary cell
are set, and the first uplink reference UL-DL configuration for the
primary cell is different from the first uplink reference UL-DL
configuration for the secondary cell, a corresponding first uplink
reference UL-DL configuration is used to specify (select, determine) a
correspondence between the subframe n in which the PHICH is allocated and
the subframe n-k in which the PUSCH corresponding to the PHICH is
allocated in each of the two serving cells.

[0303] FIG. 17 is a diagram illustrating a correspondence between the
subframe n in which the PHICH is allocated and the subframe n-k in which
the PUSCH corresponding to the PHICH is allocated in the present
embodiment. The mobile station apparatus 1 specifies (selects,
determines) a value of k on the basis of a table of FIG. 17.

[0304] In FIG. 17, in a case where a single primary cell is set, or in a
case where a single primary cell and a single secondary cell are set, and
the first uplink reference UL-DL configuration for the primary cell is
the same as the first uplink reference UL-DL configuration for the
secondary cell, an uplink-downlink configuration is set by referring to
the first uplink reference UL-DL configuration.

[0305] In FIG. 17, in a case where a single primary cell and a single
secondary cell are set, and the first uplink reference UL-DL
configuration for the primary cell is different from the first uplink
reference UL-DL configuration for the secondary cell, an uplink-downlink
configuration is set by referring to the second uplink reference UL-DL
configuration.

[0306] Hereinafter, in description of FIG. 17, the first uplink reference
UL-DL configuration and the second uplink reference UL-DL configuration
are simply referred to as an uplink-downlink configuration.

[0307] Regarding a serving cell for the uplink-downlink configurations 1
to 6 are set, a HARQ indicator (HARQ-ACK) which is received via a PHICH
corresponding to the serving cell in the subframe n is related to
transmission of a PUSCH in the subframe n-k which is specified on the
basis of the table of FIG. 17.

[0308] Regarding a serving cell for the uplink-downlink configuration 0 is
set, a HARQ indicator (HARQ-ACK) which is received via a PHICH
corresponding to the serving cell in a first resource set of the subframe
n=0 or 5, or in the subframes n=1 or 6, is related to transmission of a
PUSCH in the subframe n-k which is specified on the basis of the table of
FIG. 17.

[0309] Regarding a serving cell for the uplink-downlink configuration 0 is
set, a HARQ indicator (HARQ-ACK) which is received via a PHICH
corresponding to the serving cell in a second resource set of the
subframe n=0 or 5 is related to transmission of a PUSCH in the subframe
n-6.

[0310] For example, regarding a serving cell for which the uplink-downlink
configuration 1 is set, a HARQ indicator (HARQ-ACK) which is received via
the PHICH in [SFN=m, subframe 1] is related to transmission of the PUSCH
in [SFN=m-1, subframe 7] which is four subframes earlier than the
subframe.

[0311] The first uplink reference UL-DL configuration and the second
uplink reference UL-DL configuration are used to specify (select,
determine) a correspondence between the subframe n in which a PUSCH is
allocated and the subframe n+k in which a PHICH corresponding to the
PUSCH is allocated.

[0312] In a case where a single primary cell is set, or in a case where a
single primary cell and a single secondary cell are set, and the first
uplink reference UL-DL configuration for the primary cell is the same as
the first uplink reference UL-DL configuration for the secondary cell, a
corresponding first uplink reference UL-DL configuration is used to
specify (select, determine) a correspondence between the subframe n in
which the PUSCH is allocated and the subframe n+k in which the PHICH
corresponding to the PUSCH is allocated in each of the two serving cells.

[0313] In a case where a single primary cell and a single secondary cell
are set, and the first uplink reference UL-DL configuration for the
primary cell is different from the first uplink reference UL-DL
configuration for the secondary cell, a corresponding second uplink
reference UL-DL configuration is used to specify (select, determine) a
correspondence between the subframe n in which the PUSCH is allocated and
the subframe n+k in which the PHICH corresponding to the PUSCH is
allocated in each of the two serving cells.

[0314] FIG. 18 is a diagram illustrating a correspondence between the
subframe n in which the PUSCH is allocated and the subframe n+k in which
the PHICH corresponding to the PUSCH is allocated in the present
embodiment. The mobile station apparatus 1 specifies (selects,
determines) a value of k on the basis of a table of FIG. 18.

[0315] In FIG. 18, in a case where a single primary cell is set, or in a
case where a single primary cell and a single secondary cell are set, and
the first uplink reference UL-DL configuration for the primary cell is
the same as the first uplink reference UL-DL configuration for the
secondary cell, an uplink-downlink configuration is set by referring to
the first uplink reference UL-DL configuration.

[0316] In FIG. 18, in a case where a single primary cell and a single
secondary cell are set, and the first uplink reference UL-DL
configuration for the primary cell is different from the first uplink
reference UL-DL configuration for the secondary cell, an uplink-downlink
configuration is set by referring to the second uplink reference UL-DL
configuration.

[0317] Hereinafter, in description of FIG. 18, the first uplink reference
UL-DL configuration and the second uplink reference UL-DL configuration
are simply referred to as an uplink-downlink configuration.

[0318] In a case where transmission of the PUSCH is scheduled in the
subframe n, the mobile station apparatus 1 determines a PHICH resource in
the subframe n+k which is specified on the basis of the table of FIG. 18.

[0319] For example, regarding a serving cell for which the uplink-downlink
configuration 0 is set, in a case where transmission of the PUSCH is
scheduled in [SFN=m, subframe n=2], a PHICH resource is determined in
[SFN=m, subframe n=6].

[0320] For example, regarding a serving cell for which the uplink-downlink
configuration 0 is set, in a case where transmission of the PUSCH is
scheduled in [SFN=m, subframe n=3], a PHICH resource is determined from a
first resource set in [SFN=m+1, subframe n=0].

[0321] For example, regarding a serving cell for which the uplink-downlink
configuration 0 is set, in a case where transmission of the PUSCH is
scheduled in [SFN=m, subframe n=4], a PHICH resource is determined from a
second resource set in [SFN=m+1, subframe n=0].

[0322] For example, regarding a serving cell for which the uplink-downlink
configuration 0 is set, in a case where transmission of the PUSCH is
scheduled in [SFN=m, subframe n=7], a PHICH resource is determined in
[SFN=m+1, subframe n=1].

[0323] For example, regarding a serving cell for which the uplink-downlink
configuration 0 is set, in a case where transmission of the PUSCH is
scheduled in [SFN=m, subframe n=8], a PHICH resource is determined from a
first resource set in [SFN=m+1, subframe n=5].

[0324] For example, regarding a serving cell for which the uplink-downlink
configuration 0 is set, in a case where transmission of the PUSCH is
scheduled in [SFN=m, subframe n=9], a PHICH resource is determined from a
second resource set in [SFN=m+1, subframe n=5].

[0325] Hereinafter, the first downlink reference UL-DL configuration and
the second downlink reference UL-DL configuration will be described in
detail.

[0326] The first downlink reference UL-DL configuration and the second
downlink reference UL-DL configuration are used to specify (select,
determine) a correspondence between the subframe n in which a PDSCH is
allocated and the subframe n+k in which a HARQ-ACK corresponding to the
PDSCH is transmitted.

[0327] In a case where a single primary cell is set, or in a case where a
single primary cell and a single secondary cell are set, and the first
downlink reference UL-DL configuration for the primary cell is the same
as the first downlink reference UL-DL configuration for the secondary
cell, a corresponding first downlink reference UL-DL configuration is
used to specify (select, determine) a correspondence between the subframe
n in which the PDSCH is allocated and the subframe n+k in which a
HARQ-ACK corresponding to the PDSCH is transmitted in each of the two
serving cells.

[0328] In a case where a single primary cell and a single secondary cell
are set, and the first downlink reference UL-DL configuration for the
primary cell is different from the first downlink reference UL-DL
configuration for the secondary cell, a corresponding second downlink
reference UL-DL configuration is used to specify (select, determine) a
correspondence between the subframe n in which the PDSCH is allocated and
the subframe n+k in which a HARQ-ACK corresponding to the PDSCH is
transmitted in each of the two serving cells.

[0329] FIG. 19 is a diagram illustrating a correspondence between the
subframe n+k in which the PDSCH is allocated and the subframe n in which
a HARQ-ACK corresponding to the PDSCH is transmitted in each of the two
serving cells. The mobile station apparatus 1 specifies (selects,
determines) a value of k on the basis of a table of FIG. 19.

[0330] In FIG. 19, in a case where a single primary cell is set, or in a
case where a single primary cell and a single secondary cell are set, and
the first downlink reference UL-DL configuration for the primary cell is
the same as the first downlink reference UL-DL configuration for the
secondary cell, an uplink-downlink configuration is set by referring to
the first downlink reference UL-DL configuration.

[0331] In FIG. 19, in a case where a single primary cell is set, or in a
case where a single primary cell and a single secondary cell are set, and
the first downlink reference UL-DL configuration for the primary cell is
the same as the first downlink reference UL-DL configuration for the
secondary cell, an uplink-downlink configuration is set by referring to
the second downlink reference UL-DL configuration.

[0332] Hereinafter, in description of FIG. 19, the first downlink
reference UL-DL configuration and the second downlink reference UL-DL
configuration are simply referred to as an uplink-downlink configuration.

[0333] In a case where the mobile station apparatus 1 detects transmission
of the PDSCH in which transmission of a corresponding HARQ-ACK targeting
the mobile station apparatus 1 is to be transmitted in a subframe n-k (k
is specified on the basis of the table of FIG. 19) for a serving cell,
the HARQ-ACK is transmitted in the subframe n.

[0334] For example, the mobile station apparatus 1 does not make a
response of the HARQ-ACK to transmission of the PDSCH which is used to
transmit system information. For example, the mobile station apparatus 1
makes a response of the HARQ-ACK to transmission of the PDSCH which is
scheduled by a DCI format including the CRC scrambled with the C-RNTI.

[0335] For example, the mobile station apparatus 1 performs transmission
of the HARQ-ACK of the PDSCH received in the subframe n-6 and/or n-7 for
a serving cell for which the uplink-downlink configuration 1 is set, in
the subframe n=2.

[0336] In addition, in a case where the first uplink reference UL-DL
configuration is set, and the first downlink reference UL-DL
configuration and the transmission direction UL-DL configuration are not
set, the mobile station apparatus 1 may specify (select, determine) a
transmission direction (up/down) on the basis of the first uplink
reference UL-DL configuration.

[0337] Further, in a case where the first uplink reference UL-DL
configuration and the first downlink reference UL-DL configuration are
set, and the transmission direction UL-DL configuration is not set, the
mobile station apparatus 1 may specify (select, determine) a transmission
direction (up/down) on the basis of the first downlink reference UL-DL
configuration.

[0338] Further, the first downlink reference UL-DL configuration may not
be defined for a serving cell which has not received the second
information. In this case, the mobile station apparatus 1 and the base
station apparatus 3 may perform the above-described process performed on
the basis of the first downlink reference UL-DL configuration, on the
basis of the first uplink reference UL-DL configuration (serving cell
UL-DL configuration). A serving cell which has not received the second
information is a serving cell for which the dynamic TDD is not set.

[0339] For example, in a case where a single primary cell and a single
secondary cell are set; the second information for the primary cell has
not been received; the second information for the secondary cell has been
received; the first uplink reference UL-DL configuration (serving cell
UL-DL configuration) for the primary cell is different from the first
downlink reference UL-DL configuration for the secondary cell; and a
serving cell is the secondary cell, the second downlink reference UL-DL
configuration may be set on the basis of a pair formed by the first
uplink reference UL-DL configuration for the other serving cell (primary
cell) and the first downlink reference UL-DL configuration for the
serving cell (secondary cell).

[0340] For example, in a case where a single primary cell and a single
secondary cell are set; the second information for the primary cell has
not been received; the second information for the secondary cell has been
received; the first uplink reference UL-DL configuration (serving cell
UL-DL configuration) for the primary cell is different from the first
downlink reference UL-DL configuration for the secondary cell; and a
serving cell is the secondary cell, a corresponding second downlink
reference UL-DL configuration may be used to specify (select, determine)
a correspondence between the subframe n in which the PDSCH is allocated
and the subframe n+k in which a HARQ-ACK corresponding to the PDSCH is
transmitted in each of the two serving cells.

[0341] For example, in a case where a single primary cell and a single
secondary cell are set; the second information for the primary cell has
not been received; the second information for the secondary cell has been
received; and the first uplink reference UL-DL configuration (serving
cell UL-DL configuration) for the primary cell is the same as the first
downlink reference UL-DL configuration for the secondary cell, a
corresponding first uplink reference UL-DL configuration may be used to
specify (select, determine) a correspondence between the subframe n in
which the PDSCH is allocated and the subframe n+k in which a HARQ-ACK
corresponding to the PDSCH is transmitted in the primary cell, and a
corresponding first downlink reference UL-DL configuration may be used to
specify (select, determine) a correspondence between the subframe n in
which the PDSCH is allocated and the subframe n+k in which a HARQ-ACK
corresponding to the PDSCH is transmitted in the secondary cell.

[0342] For example, in a case where a single primary cell and a single
secondary cell are set; the second information for the primary cell has
not been received; the second information for the secondary cell has been
received; and the first uplink reference UL-DL configuration (serving
cell UL-DL configuration) for the primary cell is different from the
first downlink reference UL-DL configuration for the secondary cell, a
primary cell UL-DL configuration is set by referring to the first uplink
reference UL-DL configuration for the primary cell in FIGS. 10 and 12.

[0343] Hereinafter, CSI reporting of the present invention will be
described.

[0344] As described above, a downlink reference signal is used to measure
channel state information (CSI) of a downlink. Particularly, the NZP
CSI-RS is used for the mobile station apparatus 1 to calculate channel
state information of a downlink. In addition, a resource of the ZP CSI-RS
is set by the base station apparatus 3. The base station apparatus 3
transmits the ZP CSI-RS with zero output, and, for example, the mobile
station apparatus 1 can measure interference with a resource
corresponding to the NZP CSI-RS in a certain cell. The mobile station
apparatus 1 computes the NZP CSI-RS and a channel quality indicator (CQI)
included in the CSI by the NZP CSI-RS. Further, an index of the CQI
corresponds to a modulation method and a transport block size of a PDSCH.
The mobile station apparatus 1 calculates an index of the CQI
corresponding to a combination which causes an error rate of the
transport block not to exceed a predetermined value (for example, 0.1).
The CSI may include a rank indicator (RI), a precoding matrix indicator
(PMI), or a precoding type indicator (PTI). The measured and calculated
CSI is reported to the base station apparatus 3 through periodic CSI
reporting or aperiodic CSI reporting by using a PUCCH or a PUSCH.

[0345] Hereinafter, a description will be made of a reporting method in a
case where a periodic CSI is used in the present invention.

[0346] In a case where simultaneous transmission of a PUSCH and a PUCCH is
not set, the periodic CSI is transmitted by using the PUCCH in a subframe
to which the PUSCH is not assigned.

[0347] In a case where the simultaneous transmission of the PUSCH and the
PUCCH is not set, the periodic CSI is transmitted in a subframe to which
the PUSCH is assigned, by using the PUSCH of a serving cell in which a
given parameter ServeCelllndex of a high layer is the smallest value.

[0348] The periodic CSI is transmitted with a system frame number and a
slot number satisfying the following Equation 1.

[0349] Here, nf indicates a system frame number, and ns
indicates a slot number in a system frame. In addition, N.sub.OFFSET,CQI
indicates a timing offset, and Npd indicates the reporting
periodicity of the periodic CSI, both of which are respectively set
through signaling by a high layer on the basis of a table illustrated in
FIG. 20 in the TDD. In FIG. 20, ICQI/PMI is a parameter of which a
notification is sent by a high layer, and the mobile station apparatus 1
having received the notification of the parameter specifies (selects,
determines) a periodicity Npd and a timing offset N.sub.OFFSET,CQI
of the periodic CSI by using the table of FIG. 20. As an example, in the
case where ICQI/PMI of which a notification is sent by a high layer
is 3, it can be seen from the table of FIG. 20 that periodicity Npd
is 5, and N.sub.OFFSET,CQI is 2. Therefore, if these values are assigned
to Equation 1, it is possible to specify that the periodic CSI is
transmitted with a system frame number and a slot number satisfying the
following Equation 2.

(10×nf+.left brkt-bot.ns/2.right brkt-bot.-2)mod 5=0
[Math 2]

[0350] Therefore, as illustrated in FIG. 21, the periodic CSI is
transmitted in fifth and sixth (ns=4 and 5) slots (the subframe #2)
and fifteenth and sixteenth (ns=14 and 15) slots (the subframe #7)
of each system frame.

[0351] The periodic CSI is transmitted as a UL signal in the designated
subframes via a PUCCH or a PUSCH, but in a case where the transmitted
periodic CSI and a DL signal for any mobile station apparatus are
transmitted in the same subframe, the two signals interfere with each
other, and this causes deterioration in each signal. Therefore, in the
present embodiment, a periodicity for transmitting the periodic CSI is
restricted by using the first downlink reference UL-DL configuration.

[0352] Hereinafter, a description will be made of a case where the
periodicity for transmitting the periodic CSI is determined on the basis
of the first downlink reference UL-DL configuration. FIG. 22 illustrates
configurations of a downlink subframe, a special subframe, and an uplink
subframe, and supported reporting periodicities of the periodic CSI in
the configurations in the first downlink reference UL-DL configuration.
In the present embodiment, the mobile station apparatus 1 can report the
periodic CSI only in the uplink subframe hatched in FIG. 22. For this
reason, for example, in a case where the first downlink reference UL-DL
configuration is 2, an uplink subframe is present every five subframes,
and thus a supported reporting periodicity of the periodic CSI is 5 ms or
more, and a reporting periodicity of 1 ms is not necessary. Similarly, in
a case where the first downlink reference UL-DL configuration is 3, an
uplink subframe is present after one or two subframes, but a downlink
subframe is necessary to be present after five subframes, and thus a
reporting periodicity of 5 ms is not necessary. Thus, a periodicity for
transmitting the periodic CSI is restricted as follows on the basis of
the first downlink reference UL-DL configuration.

[0353] (1) The periodic CSI reporting periodicity Npd=1 is applicable
only if the first downlink reference UL-DL configuration belongs to 0, 1,
3, 4 and 6, and the periodic CSI is transmitted in a case where a
subframe is an uplink subframe indicated by the first downlink reference
UL-DL configuration.

[0354] (2) The periodic CSI reporting periodicity Npd=5 is applicable
only if the first downlink reference UL-DL configuration belongs to 0, 1,
2 and 6. However, in a case where the first downlink reference UL-DL
configuration is 6, the reporting periodicity may be applicable only when
the timing offset N.sub.OFFSET,CQI is 2 or 3.

[0355] (3) The periodic CSI reporting periodicity Npd=10, 20, 40, 80,
and 160 are applicable for all of the first downlink reference UL-DL
configurations.

[0356] In addition, even a periodicity supported on the basis of the first
downlink reference UL-DL configuration may be excluded in a case where a
subframe designated by the timing offset N.sub.OFFSET,CQI is a downlink
subframe indicated by the first downlink reference UL-DL configuration at
all times. For example, it is assumed that the periodic CSI reporting
periodicity of 5 ms is designated in a case where the first downlink
reference UL-DL configuration is 0. In this case, if the timing offset 0
is designated, corresponding subframes (the subframes #0 and #5) are
downlink subframes indicated by the first downlink reference UL-DL
configuration at all times, and thus the periodic CSI which is an uplink
signal cannot be transmitted. In the same manner for a case of the timing
offset 1, corresponding subframes (the subframes #1 and #6) are special
subframes indicated by the first downlink reference UL-DL configuration
at all times, and thus the periodic CSI cannot be transmitted at all
times in a case where the periodic CSI cannot be transmitted in the
special subframe indicated by the first downlink reference UL-DL
configuration. Therefore, in a case where the first downlink reference
UL-DL configuration is 0, the timing offset N.sub.OFFSET,CQI is
preferably selected from among 2, 3, and 4, and is set.

[0357] As described above, in the present invention, the base station
apparatus 3 restricts a reporting periodicity and/or a timing offset of
the periodic CSI which is reported by the mobile station apparatus 1 on
the basis of the first downlink reference UL-DL configuration of which a
notification is sent to the mobile station apparatus 1.

[0358] In addition, the mobile station apparatus 1 restricts an applicable
reporting periodicity and/or a timing offset of the periodic CSI on the
basis of the first downlink reference UL-DL configuration of which a
notification is sent from the base station apparatus 3. The mobile
station apparatus 1 may perform predetermined error handling in a case
where a reporting periodicity and/or a timing offset of which a
notification is sent via a high layer is not an applicable value/are not
applicable values. Further, the predetermined error handling may be
performed in the high layer.

[0359] As an example of the predetermined error handling, in a case where
a reporting periodicity and/or a timing offset of the periodic CSI, of
which a notification is sent, are (is) not an applicable value, the
mobile station apparatus 1 discards the value.

[0360] As another example of the predetermined error handling, in a case
where a reporting periodicity and/or a timing offset of the periodic CSI,
of which a notification is sent, is not an applicable value, the mobile
station apparatus 1 requests the base station apparatus 3 to transmit a
reporting periodicity and/or a timing offset of the periodic CSI again.

[0361] As another example of the predetermined error handling, in a case
where a reporting periodicity and/or a timing offset of the periodic CSI,
of which a notification is sent, is not an applicable value, the mobile
station apparatus 1 selects and uses a value from among applicable values
according to a predetermined rule.

[0362] As mentioned above, a description has been made of a case where a
periodicity and/or a timing off for transmitting the periodic CSI are
(is) restricted on the basis of the first downlink reference UL-DL
configuration, but the method is also effective in a case where a
plurality of serving cells are set for the mobile station apparatus 1. In
this case, UE restricts a periodicity and/or a timing offset for
transmitting the periodic CSI on the basis of the first downlink
reference UL-DL configuration for a primary cell.

[0363] In addition, in a case where the second information has been
received, the mobile station apparatus 1 restricts a periodicity and/or a
timing for transmitting the periodic CSI on the basis of the first
downlink reference UL-DL configuration which is set on the basis of the
second information. In a case where the second information has not been
received, the mobile station apparatus 1 restricts a periodicity and/or a
timing offset for transmitting the periodic CSI on the basis of the first
downlink reference UL-DL configuration which is set on the basis of the
first information. This will be described in detail with reference to a
flowchart illustrated in FIG. 23. The mobile station apparatus 1
determines whether or not the second information for a primary cell has
been received (S1400). If the second information for the primary cell has
been received, the mobile station apparatus 1 sets the first downlink
reference UL-DL configuration for the primary cell on the basis of the
second information for the primary cell (S1401). If the second
information for the primary cell has not been received (else/otherwise),
the mobile station apparatus 1 sets the first downlink reference UL-DL
configuration for the primary cell on the basis of the first information
for the primary cell (S1402). The mobile station apparatus 1 restricts a
reporting periodicity and/or a timing offset of the periodic CSI on the
basis of the first downlink reference UL-DL configuration for the primary
cell which is set in S1401 or S1402 (S1403).

[0364] However, the method is described on the premise that the mobile
station apparatus 1 transmits the periodic CSI via the PUCCH only in a
primary cell, but another method is employed in a case where the mobile
station apparatus 1 transmits the periodic CSI via the PUCCH in a
secondary cell. For example, the mobile station apparatus 1 may receive
the second information for a secondary cell, set the first downlink
reference UL-DL configuration for the secondary cell on the basis of the
second information, and restrict a reporting periodicity and/or a timing
offset of the periodic CSI which is transmitted via the PUCCH of the
secondary cell on the basis of the first downlink reference UL-DL
configuration for the secondary cell. For example, the mobile station
apparatus 1 may restrict a reporting periodicity and/or a timing offset
of the periodic CSI which is transmitted via the PUCCH of the primary
cell and/or the secondary cell on the basis of the first downlink
reference UL-DL configuration for the primary cell and the first downlink
reference UL-DL configuration for the secondary cell.

[0365] FIG. 24 is a schematic block diagram illustrating a configuration
of the mobile station apparatus 1 according to the present embodiment. As
illustrated in FIG. 7, the mobile station apparatus 1 includes a higher
layer processing unit 101, a control unit 103, a reception unit 105, a
transmission unit 107, and a transmit and receive antenna 109. In
addition, the higher layer processing unit 101 includes a radio resource
control portion 1011, a subframe setting portion 1013, a scheduling
information analysis portion 1015, and a CSI transmission control portion
1017. Further, the reception unit 105 includes a decoding portion 1051, a
demodulation portion 1053, a demultiplexing portion 1055, a radio
reception portion 1057, and a channel measurement portion 1059.
Furthermore, the transmission unit 107 includes a coding portion 1071, a
modulation portion 1073, a multiplexing portion 1075, a radio
transmission portion 1077, and an uplink reference signal generation
portion 1079.

[0366] The higher layer processing unit 101 outputs uplink data (transport
block) which is generated according to a user's operation or the like, to
the transmission unit 107. In addition, the higher layer processing unit
101 performs processes on a medium access control (MAC) layer, a packet
data convergence protocol (PDCP) layer, a radio link control (RLC) layer,
and a radio resource control (RRC) layer.

[0367] The radio resource control portion 1011 of the higher layer
processing unit 101 manages various items for setting information of the
terminal. In addition, the radio resource control portion 1011 generates
information which is to be mapped in each channel of an uplink, and
outputs the information to the transmission unit 107.

[0370] The scheduling information analysis portion 1015 of the higher
layer processing unit 101 analyzes a DCI format (scheduling information)
which is received via the reception unit 105, generates control
information for controlling the reception unit 105 and the transmission
unit 107 on the basis of a result of analyzing the DCI format, and
outputs the control information to the control unit 103.

[0371] The scheduling information analysis portion 1015 also determines
timings for performing a transmission process and a reception process on
the basis of the first uplink reference UL-DL configuration, the first
downlink reference UL-DL configuration, the second uplink reference UL-DL
configuration, the second downlink reference UL-DL configuration, and/or
the transmission direction UL-DL configuration.

[0372] The CSI transmission control portion 1017 reads a parameter
indicating a reporting periodicity and/or a timing offset of the periodic
CSI from RRC parameters of which a notification is sent from the base
station apparatus 3 via an RRC layer, and specifies (selects, determines)
a subframe in which the periodic CSI is transmitted.

[0373] The CSI transmission control portion 1017 restricts a subframe used
to transmit the periodic CSI on the basis of the first downlink reference
UL-DL configuration which is set by the subframe setting portion 1013.
For example, in a case where a reporting periodicity and/or a timing
offset of the periodic CSI, set by the RRC parameter, cannot be used in
the set first downlink reference UL-DL configuration, the CSI
transmission control portion 1017 performs the above-described error
handling.

[0374] The CSI transmission control portion 1017 inserts channel state
information measured by the channel measurement portion 1059 into a PUCCH
or a PUSCH in a subframe in which the periodic CSI is transmitted, and
outputs the PUCCH or the PUSCH to the transmission unit 107.

[0375] The control unit 103 generates control signals for controlling the
reception unit 105 and the transmission unit 107 on the basis of the
control information from the higher layer processing unit 101. The
control unit 103 outputs the generated control signals to the reception
unit 105 and the transmission unit 107 so as to control the reception
unit 105 and the transmission unit 107.

[0376] The reception unit 105 demultiplexes, demodulates and decodes a
received signal which is received from the base station apparatus 3 via
the transmit and receive antenna 109, in response to the control signal
which is input from the control unit 103, and outputs the decoded
information to the higher layer processing unit 101.

[0377] The radio reception portion 1057 converts (down-converts) a
downlink signal which is received via the transmit and receive antenna
109 into an intermediate frequency so as to remove unnecessary frequency
components, controls an amplification level so that a signal level is
appropriately maintained, orthogonally demodulates the received signal on
the basis of an in-phase component and an orthogonal component thereof,
and converts the orthogonally demodulated analog signal into a digital
signal. The radio reception portion 1057 removes a portion corresponding
to a guard interval (GI) from the converted digital signal, and performs
fast Fourier transform (FFT) on the signal from which the guard interval
is removed, so as to extract a signal of the frequency domain.

[0378] The demultiplexing portion 1055 demultiplexes the extracted signal
into the PHICH, the PDCCH, the EPDCCH, the PDSCH, and the downlink
reference signal. Further, the demultiplexing portion 1055 compensates
for channels such as the PHICH, the PDCCH, the EPDCCH, and the PDSCH on
the basis of channel estimation values which are input from the channel
measurement portion 1059. Furthermore, the demultiplexing portion 1055
outputs the demultiplexed downlink reference signal to the channel
measurement portion 1059.

[0379] The demodulation portion 1053 multiplies and combines the PHICH by
and with a corresponding sign, demodulates the combined signal in a
binary phase shift keying (BPSK) modulation method, and outputs an
obtained signal to the decoding portion 1051. The decoding portion 1051
decodes the PHICH directed to the mobile station apparatus, and outputs a
decoded HARQ indicator to the higher layer processing unit 101. The
demodulation portion 1053 demodulates the PDCCH and/or the EPDCCH in a
QPSK modulation method, and outputs an obtained result to the decoding
portion 1051. In a case where the decoding portion 1051 tries to decode
the PDCCH and/or the EPDCCH and succeeds in the decoding, and the
decoding portion outputs decoded downlink control information and RNTI
corresponding to the downlink control information to the higher layer
processing unit 101.

[0380] The demodulation portion 1053 demodulates the PDSCH using a
modulation method such as quadrature phase shift keying (QPSK), 16
quadrature amplitude modulation (QAM), or 64 QAM, of which a notification
is sent in a downlink grant, and outputs an obtained result to the
decoding portion 1051. The decoding portion 1051 performs decoding on the
basis of information regarding a coding rate of which a notification has
been sent with the downlink control information, and outputs decoded
downlink data (transport block) to the higher layer processing unit 101.

[0381] The channel measurement portion 1059 measures path loss of a
downlink or a channel state on the basis of the downlink reference signal
which is input from the demultiplexing portion 1055, and outputs the
measured path loss or channel state to the higher layer processing unit
101. In addition, the channel measurement portion 1059 calculates a
channel estimation value of the downlink on the basis of the downlink
reference signal, and outputs the estimation value to the demultiplexing
portion 1055.

[0382] The transmission unit 107 generates an uplink reference signal in
response to the control signal which is input from the control unit 103,
codes and modulates uplink data (transport block) which is input from the
higher layer processing unit 101, multiplexes the PUCCH, the PUSCH, and
the generated uplink reference signal, and transmits the obtained result
to the base station apparatus 3 via the transmit and receive antenna 109.

[0383] The coding portion 1071 performs coding such as convolutional
coding or block coding on the uplink control information which is input
from the higher layer processing unit 101. In addition, the coding
portion 1071 performs turbo coding on the basis of information used for
scheduling the PUSCH.

[0384] The modulation portion 1073 modulates the coded bits which are
input from the coding portion 1071 using a modulation method such as
BPSK, QPSK, 16 QAM, or 64 QAM, of which a notification is sent with the
downlink control information, or through a modulation method which is
predefined for each channel. The modulation portion 1073 determines the
number of data sequences which are spatially multiplexed on the basis of
the information used for scheduling the PUSCH, maps a plurality of uplink
data items which are transmitted in the same PUSCH to a plurality of
sequences by using multiple input multiple output spatial multiplexing
(MIMO SM), and performs precoding on the sequences.

[0385] The uplink reference signal generation portion 1079 generates
sequences obtained according to a predefined rule (expression) on the
basis of a physical cell identity (PCI; referred to as a cell ID or the
like) for identifying the base station apparatus 3, a bandwidth in which
the uplink reference signal is mapped, cyclic shift of which a
notification has been sent in an uplink grant, values of parameters for
generation of a DMRS sequence, and the like. In response to the control
signal which is input from the control unit 103, the multiplexing portion
1075 arranges modulation symbols of the PUSCH in parallel, and performs
discrete Fourier transform (DFT) thereon. In addition, the multiplexing
portion 1075 multiplexes signals of the PUCCH and the PUSCH, and the
generated uplink reference signal for each transmit antenna port. In
other words, the multiplexing portion 1075 maps the signals of the PUCCH
and the PUSCH and the generated uplink reference signal in resource
elements for each transmit antenna port.

[0386] The radio transmission portion 1077 performs inverse fast Fourier
transform (IFFT) on the multiplexed signal so as to perform modulation
thereon through an SC-FDMA method; adds a guard interval to a SC-FDMA
symbol which is SC-FDMA-modulated, so as to generate a digital signal
with a base band; converts the digital signal with the base band into an
analog signal; generates an in-phase component and an orthogonal
component with an intermediate frequency from the analog signal; removes
a remaining frequency component for an intermediate frequency band;
converts (up-converts) the signal with the intermediate frequency into a
signal with a radio frequency; removes a remaining frequency component
therefrom; amplifies power of the signal; and outputs the signal to the
transmit and receive antenna 109 so that the signal is transmitted.

[0387] FIG. 25 is a schematic block diagram illustrating a configuration
of the base station apparatus 3 of the present embodiment. As illustrated
in FIG. 25, the base station apparatus 3 includes a higher layer
processing unit 301, a control unit 303, a reception unit 305, a
transmission unit 307, and a transmit and receive antenna 309. In
addition, the higher layer processing unit 301 includes a radio resource
control portion 3011, a subframe setting portion 3013, a scheduling
portion 3015, and a CSI transmission timing determination portion 3017.
Further, the reception unit 305 includes a decoding portion 3051, a
demodulation portion 3053, a demultiplexing portion 3055, a radio
reception portion 3057, and a channel measurement portion 3059.
Furthermore, the transmission unit 307 includes a coding portion 3071, a
modulation portion 3073, a multiplexing portion 3075, a radio
transmission portion 3077, and a downlink reference signal generation
portion 3079.

[0388] The higher layer processing unit 301 performs processes on a medium
access control (MAC) layer, a packet data convergence protocol (PDCP)
layer, a radio link control (RLC) layer, and a radio resource control
(RRC) layer. In addition, the higher layer processing unit 301 generates
control information for controlling the reception unit 305 and the
transmission unit 307 and transmits the control information to the
control unit 303.

[0389] The radio resource control portion 3011 of the higher layer
processing unit 301 generates downlink data (transport block) which will
be mapped in the PDSCH of a downlink, system information, an RRC message,
a MAC control element (CE), and the like, or acquires the information
from a higher node, and outputs the information to the transmission unit
307. In addition, the radio resource control portion 3011 manages various
items of configuration information of each of the mobile station
apparatuses 1.

[0390] The subframe setting portion 3013 of the higher layer processing
unit 301 performs, on each of the mobile station apparatuses 1,
management of the first uplink reference UL-DL configuration, the first
downlink reference UL-DL configuration, the second uplink reference UL-DL
configuration, the second downlink reference UL-DL configuration, and the
transmission direction UL-DL configuration.

[0391] The subframe setting portion 3013 sets, in each of the mobile
station apparatuses 1, the first uplink reference UL-DL configuration,
the first downlink reference UL-DL configuration, the second uplink
reference UL-DL configuration, the second downlink reference UL-DL
configuration, and the transmission direction UL-DL configuration.

[0392] The subframe setting portion 3013 generates first information
indicating the first uplink reference UL-DL configuration, second
information indicating the first downlink reference UL-DL configuration,
and third information indicating the transmission direction UL-DL
configuration. The subframe setting portion 3013 transmits the first
information, the second information, and the third information to the
mobile station apparatus 1 via the transmission unit 307.

[0393] The base station apparatus 3 determines the first uplink reference
UL-DL configuration, the first downlink reference UL-DL configuration,
the second uplink reference UL-DL configuration, the second downlink
reference UL-DL configuration, and/or the transmission direction UL-DL
configuration for the mobile station apparatus 1. In addition, the base
station apparatus 3 may be given an instruction for the first uplink
reference UL-DL configuration, the first downlink reference UL-DL
configuration, the second uplink reference UL-DL configuration, the
second downlink reference UL-DL configuration, and/or the transmission
direction UL-DL configuration, related to the mobile station apparatus 1,
from a higher node.

[0394] For example, the subframe setting portion 3013 may determine the
first uplink reference UL-DL configuration, the first downlink reference
UL-DL configuration, the second uplink reference UL-DL configuration, the
second downlink reference UL-DL configuration, and/or the transmission
direction UL-DL configuration on the basis of an uplink traffic amount
and a downlink traffic amount.

[0395] The scheduling portion 3015 of the higher layer processing unit 301
determines a frequency and a subframe in which physical channels (the
PDSCH and the PUSCH) are assigned, a coding rate of the physical channels
(the PDSCH and the PUSCH), a modulation method, transmission power, and
the like, on the basis of a channel estimation value, channel quality, or
the like which is input from the channel measurement portion 3059. The
scheduling portion 3015 determines whether a downlink physical channel
and/or a downlink physical signal (are) is scheduled or an uplink
physical channel and/or an uplink physical signal (are) is scheduled, in
a flexible subframe. The scheduling portion 3015 generates control
information (for example, a DCI format) for controlling the reception
unit 305 and the transmission unit 307 on the basis of the scheduling
result, and outputs the control information to the control unit 303.

[0396] The scheduling portion 3015 generates information used for
scheduling the physical channels (the PDSCH and the PUSCH) on the basis
of the scheduling result. The scheduling portion 3015 determines timings
for performing a transmission process and a reception process on the
basis of the first uplink reference UL-DL configuration, the first
downlink reference UL-DL configuration, the second uplink reference UL-DL
configuration, the second downlink reference UL-DL configuration, and/or
the transmission direction UL-DL configuration.

[0398] The CSI transmission timing determination portion 3017 may restrict
a subframe in which the mobile station apparatus 1 transmits the periodic
CSI on the basis of the first downlink reference UL-DL configuration
which is determined by the subframe setting portion 3013. In addition,
the CSI transmission timing determination portion 3017 may restrict a
periodicity and/or a timing offset in which the mobile station apparatus
1 transmits the periodic CSI on the basis of the first downlink reference
UL-DL configuration which is determined by the subframe setting portion
3013.

[0399] The control unit 303 generates control signals for controlling the
reception unit 305 and the transmission unit 307 on the basis of the
control information from the higher layer processing unit 301. The
control unit 303 outputs the generated control signals to the reception
unit 305 and the transmission unit 307 so as to control the reception
unit 305 and the transmission unit 307.

[0400] The reception unit 305 demultiplexes, demodulates and decodes a
received signal which is received from the mobile station apparatus 1 via
the transmit and receive antenna 309, in response to the control signal
which is input from the control unit 303, and outputs the decoded
information to the higher layer processing unit 301. The radio reception
portion 3057 converts (down-converts) an uplink signal which is received
via the transmit and receive antenna 309 into an intermediate frequency
so as to remove unnecessary frequency components, controls an
amplification level so that a signal level is appropriately maintained,
orthogonally demodulates the received signal on the basis of an in-phase
component and an orthogonal component thereof, and converts the
orthogonally demodulated analog signal into a digital signal.

[0401] The radio reception portion 3057 removes a portion corresponding to
a guard interval (GI) from the converted digital signal. The radio
reception portion 3057 performs fast Fourier transform (FFT) on the
signal from which the guard interval is removed, so as to extract a
signal of the frequency domain which is thus output to the demultiplexing
portion 3055.

[0402] The demultiplexing portion 1055 demultiplexes the signal which is
input from the radio reception portion 3057, into signals such as the
PUCCH, the PUSCH, and the uplink reference signal. In addition, this
demultiplexing is performed on the basis of radio resource assignment
information which is determined in advance by the radio resource control
portion 3011 and is included in an uplink grant of which the base station
apparatus 3 notifies to each mobile station apparatus 1. Further, the
demultiplexing portion 3055 compensates channels such as the PUCCH and
the PUSCH on the basis of channel estimation values which are input from
the channel measurement portion 3059. Furthermore, the demultiplexing
portion 3055 outputs the demultiplexed uplink reference signal to the
channel measurement portion 3059.

[0403] The demodulation portion 3053 performs inverse discrete Fourier
transform (IDFT) on the PUSCH so as to acquire modulation symbols, and
performs demodulation of the received signal on each of the modulation
symbols of the PUCCH and the PUSCH, by using a modulation method which is
predefined, such as binary phase shift keying (BPSK), QPSK, 16 QAM, or 64
QAM, or a modulation method of which the base station apparatus 3
notifies the mobile station apparatus 1 in advance in an uplink grant.
The demodulation portion 3053 demultiplexes modulation symbols of a
plurality of uplink data items transmitted in the same PUSCH by using the
MIMO SM on the basis of the number of spatially multiplexed sequences of
which a notification is sent to each mobile station apparatus 1 in
advance in the uplink grant and information for giving an instruction for
precoding which will be performed on the sequences.

[0404] The decoding portion 3051 decodes coded bits of the demodulated
PUCCH and PUSCH at a coding rate which is predefined in a predefined
coding method or of which the base station apparatus 3 notifies the
mobile station apparatus 1 in the uplink grant in advance, and outputs
decoded uplink data and uplink control information to the higher layer
processing unit 101. In a case where the PUSCH is retransmitted, the
decoding portion 3051 performs decoding by using coded bits which are
input from the higher layer processing unit 301 and are stored in a HARQ
buffer and the demodulated coded bits. The channel measurement portion
3059 measures channel estimation values, quality of the channels, and the
like on the basis of the uplink reference signal which is input from the
demultiplexing portion 3055, and outputs the measured results to the
demultiplexing portion 3055 and the higher layer processing unit 301.

[0405] The transmission unit 307 generates a downlink reference signal in
response to the control signal which is input from the control unit 303,
codes and modulates the HARQ indicator, the downlink control signal, and
the downlink data which are input from the higher layer processing unit
301, multiplexes the PHICH, the PDCCH, the EPDCCH, the PDSCH, and the
downlink reference signal, and transmits a signal to the mobile station
apparatus 1 via the transmit and receive antenna 309.

[0406] The coding portion 3071 performs coding on the HARQ indicator, the
downlink control information, and the downlink data which are input from
the higher layer processing unit 301, by using a predefined coding method
such as block coding, convolutional coding, or turbo coding, or by using
a coding method determined by the radio resource control portion 3011.
The modulation portion 3073 modulates the coded bits which are input from
the coding portion 3071 by using a predefined modulation method such as
BPSK, QPSK, 16 QAM, or 64 QAM, or by using a modulation method determined
by the radio resource control portion 3011.

[0407] The downlink reference signal generation portion 3079 generates
sequences which are obtained using a predefined rule and are known to the
mobile station apparatus 1, as the downlink reference signal, on the
basis of a physical cell identity (PCI) or the like for identifying the
base station apparatus 3. The multiplexing portion 3075 multiplexes the
modulation symbol of each modulated channel and the generated downlink
reference signal. In other words, the multiplexing portion 3075 maps the
modulation symbol of each modulated channel and the generated downlink
reference signal in resource elements.

[0408] The radio transmission portion 3077 performs inverse fast Fourier
transform (IFFT) on the multiplexed modulation symbol so as to perform
modulation thereon through an OFDM method; adds a guard interval to an
OFDM symbol which is OFDM-modulated, so as to generate a digital signal
with a base band; converts the digital signal with the base band into an
analog signal; generates an in-phase component and an orthogonal
component with an intermediate frequency from the analog signal; removes
a remaining frequency component from an intermediate frequency band;
converts (up-converts) the signal with the intermediate frequency into a
signal with a radio frequency (RF); removes a remaining frequency
component therefrom; amplifies power of the signal; and outputs the
signal to the transmit and receive antenna 309 so that the signal is
transmitted.

[0409] As mentioned above, in the present embodiment, a reporting
periodicity and/or a timing offset of the periodic CSI is restricted on
the basis of the set first downlink reference UL-DL configuration, and
thus it is possible to prevent conflict from occurring when the mobile
station apparatus 1 in which the dynamic TDD is configured transmits the
periodic CSI at a timing at which the base station apparatus 3 transmits
a downlink signal.

[0410] In addition, only the periodic CSI has been described in the above
method, but the method may be applied to other pieces of information as
long as the information can be periodically transmitted. For example, the
method may be applied to a scheduling request (SR) indicating a request
for a PUSCH resource.

[0411] A subframe used to transmit the SR is specified (selected,
determined) on the basis of the following Equation 3.

[0412] Here, of indicates a system frame number, and ns indicates a
slot number in a system frame. In addition, N.sub.OFFSET,SR indicates a
transmission timing offset of the SR, and SRPERIODICITY indicates a
periodicity of a subframe in which the SR can be transmitted, both of
which are respectively set through signaling of a high layer on the basis
of a table illustrated in FIG. 26. In FIG. 26, ISR is a parameter of
which a notification is sent from a high layer, and the mobile station
apparatus 1 having received the notification of the parameter specifies
(selects, determines) SRPERIODICITY and N.sub.OFFSET,SR by using the
table shown in FIG. 26.

[0413] Hereinafter, a description will be made of a case where a
periodicity of a subframe in which the SR can be transmitted on the basis
of the first downlink reference UL-DL configuration. FIG. 27 illustrates
configurations of a downlink subframe, a special subframe, and an uplink
subframe in the first downlink reference UL-DL configuration, and
supported periodicities of a subframe in which the SR can be transmitted
in the configuration. In the present embodiment, the mobile station
apparatus 1 can report the periodic CSI only in the uplink subframe
hatched in FIG. 22. Thus, a periodicity of a subframe in which the SR can
be transmitted is restricted as follows on the basis of the first
downlink reference UL-DL configuration.

[0414] (1) SRPERIODICITY=1 can be set only in a case where the first
downlink reference UL-DL configurations are 0, 1, 3, 4 and 6, and the SR
can be transmitted in a case where a subframe is an uplink subframe
indicated by the first downlink reference UL-DL configuration.

[0415] (2) SRPERIODICITY=2 can be set only in a case where the first
downlink reference UL-DL configurations are 0, 3 and 6, and the SR can be
transmitted in a case where a subframe for each periodicity is an uplink
subframe indicated by the first downlink reference UL-DL configuration.
However, in a case where the first downlink reference UL-DL configuration
is 3, the reporting periodicity may be set only when the timing offset
N.sub.OFFSET,SR is 0.

[0416] (3) SRPERIODICITY=5 can be set only in a case where the first
downlink reference UL-DL configurations are 0, 1, 2 and 6. However, in a
case where the first downlink reference UL-DL configuration is 6, the
reporting periodicity may be set only when the timing offset
N.sub.OFFSET,SR is 2 or 3.

[0417] (4) SRPERIODICITY=10, 20, 40, and 80 can be set by all of the
first downlink reference UL-DL configurations.

[0418] In addition, even a periodicity supported on the basis of the first
downlink reference UL-DL configuration may be excluded in a case where a
subframe designated by the timing offset N.sub.OFFSET,SR is a downlink
subframe indicated by the first downlink reference UL-DL configuration at
all times.

[0419] In the same manner as in the case of the periodic CSI,
predetermined error handling may be performed in a case where a
periodicity and/or a timing offset of a subframe in which the SR can be
transmitted, of which a notification is sent via a high layer are (is)
not an applicable value. Further, the predetermined error handling may be
performed in the high layer.

[0420] In addition, in a case where the second information has been
received, the mobile station apparatus 1 restricts a periodicity and/or a
timing off of a subframe in which the SR can be transmitted, on the basis
of the first downlink reference UL-DL configuration which is set on the
basis of the second information. In a case where the second information
has not been received, the mobile station apparatus 1 restricts a
periodicity and/or a timing offset of a subframe in which the SR can be
transmitted, on the basis of the first downlink reference UL-DL
configuration which is set on the basis of the first information. This
will be described in detail with reference to a flowchart illustrated in
FIG. 28. The mobile station apparatus 1 determines whether or not the
second information for a primary cell has been received (S1500). If the
second information for the primary cell has been received, the mobile
station apparatus 1 sets the first downlink reference UL-DL configuration
for the primary cell on the basis of the second information for the
primary cell (S1501). If the second information for the primary cell has
not been received (else/otherwise), the mobile station apparatus 1 sets
the first downlink reference UL-DL configuration for the primary cell on
the basis of the first information for the primary cell (S1502). The
mobile station apparatus 1 restricts a reporting periodicity and/or a
timing offset of a subframe in which the SR can be transmitted, on the
basis of the first downlink reference UL-DL configuration for the primary
cell which is set in S1501 or S1502 (S1503).

[0421] However, the method is described on the premise that the mobile
station apparatus 1 transmits the SR via the PUCCH only in a primary
cell, however, another method is employed in a case where the mobile
station apparatus 1 transmits the SR via the PUCCH in a secondary cell.
For example, the mobile station apparatus 1 may receive the second
information for a secondary cell, set the first downlink reference UL-DL
configuration for the secondary cell on the basis of the second
information, and restrict a reporting periodicity and/or a timing offset
of a subframe in which the SR can be transmitted in the secondary cell on
the basis of the first downlink reference UL-DL configuration for the
secondary cell. For example, the mobile station apparatus 1 may restrict
a reporting periodicity and/or a timing offset of the SR which is
transmitted in the primary cell and/or the secondary cell on the basis of
the first downlink reference UL-DL configuration for the primary cell and
the first downlink reference UL-DL configuration for the secondary cell.

[0422] As mentioned above, a periodicity and/or a timing offset of a
subframe in which the SR can be transmitted is restricted on the basis of
the set first downlink reference UL-DL configuration, and thus it is
possible to prevent conflict from occurring when the mobile station
apparatus 1 in which the dynamic TDD is configured transmits the SR at a
timing at which the base station apparatus 3 transmits a downlink signal.

[0423] (i) A mobile station apparatus 1 of the present embodiment performs
periodic channel state information reporting to a base station apparatus
3, and the mobile station apparatus 1 includes a reception unit 105 that
receives first information, second information, and index information
(ICQI/PMI) indicating a value (Npd) of reporting periodicity of
the channel state information, from the base station apparatus 3; and a
CSI transmission control portion 1017 that determines the value
(Npd) of reporting periodicity of the channel state information on
the basis of the index information (ICQI/PMI), in which the
applicable value (Npd) is based on a certain UL-DL configuration, in
which, in a case where the second information is not configured, the
certain UL-DL configuration is a UL-DL configuration indicated by the
first information, and in which, in a case where the second information
is configured, the certain UL-DL configuration is a UL-DL configuration
indicated by the second information.

[0424] (ii) The reception unit 105 of the mobile station apparatus 1
receives third information, and a UL-DL configuration indicated by the
third information is used for the channel state information measurement.

[0425] (iii) In the mobile station apparatus 1 of the present embodiment,
each of the first information and the second information corresponds to a
primary cell.

[0426] (iv) In the mobile station apparatus 1 of the present embodiment,
in a case where the second information is configured, a scheduling timing
of a physical uplink shared channel is set according to a UL-DL
configuration indicated by the first information, and a downlink HARQ
timing is set according to a UL-DL configuration indicated by the second
information.

[0427] (v) In the mobile station apparatus 1 of the present embodiment, in
a case where the second information is configured, uplink scheduling
timing and downlink HARQ timing are set according to a UL-DL
configuration indicated by the first information.

[0428] (vi) In the mobile station apparatus 1 of the present embodiment,
the index information (ICQI/PMI) indicates an offset value
(N.sub.OFFSET,CQI) for the channel state information reporting.

[0429] (vii) A base station apparatus 3 receives periodic channel state
information reporting from a mobile station apparatus 1, and the base
station apparatus 3 includes a CSI transmission timing determination
portion 3017 that generates index information (ICQI/PMI) indicating
a value (Npd) for reporting periodicity of the channel state
information; and a transmission unit 307 that transmits first
information, second information, and the index information
(ICQI/PMI) to the mobile station apparatus 1, in which the
applicable value (Npd) is based on a certain UL-DL configuration, in
which, in a case where the second information is configured, scheduling
timing of a physical uplink shared channel is set according to a UL-DL
configuration indicated by the first information, downlink HARQ timing is
configured according to a UL-DL configuration indicated by the second
information, and the certain UL-DL configuration which is the UL-DL
configuration indicated by the second information.

[0430] (viii) In base station apparatus 3 of the present embodiment, in a
case where the second information is configured, uplink scheduling timing
and downlink HARQ timing are set according to a UL-DL configuration
indicated by the first information, and the certain UL-DL configuration
is the UL-DL configuration is indicated by the first information.

[0431] (ix) The transmission unit 307 of the base station apparatus
transmits third information, and a UL-DL configuration indicated by the
third information is used for the channel state information measurement.

[0432] (x) In the base station apparatus 3 of the present embodiment, each
of the first information and the second information corresponds to a
primary cell.

[0433] (xi) The index information (ICQI/PMI) generated by the CSI
transmission timing determination portion 3017 of the base station
apparatus 3 of the present embodiment indicates an offset value
(N.sub.OFFSET,CQI) for the channel state information reporting.

[0434] In addition, in the above-described embodiment, the mobile station
apparatus 1 may include a subframe setting portion 1013 that specifies a
first uplink reference UL-DL configuration and a first downlink reference
UL-DL configuration on the basis of information of which a notification
is sent from the base station apparatus 3; and a CSI transmission control
portion 1017 that specifies a value (Npd) for reporting periodicity
of a subframe for reporting the channel state information to the base
station apparatus 3 on the basis of the index information (ICQI/PMI)
indicating the value (Npd) for reporting periodicity of the channel
state information, of which a notification is sent from the base station
apparatus 3, and information indicating the value (Npd) for
reporting periodicity of the channel state information, supported by the
first downlink reference UL-DL configuration.

[0435] Further, in the above-described embodiment, the mobile station
apparatus 1 may include a subframe setting portion 1013 that specifies a
first uplink reference UL-DL configuration on the basis of first
information of which a notification is sent from the base station
apparatus 3 and specifies a first downlink reference UL-DL configuration
on the basis of second information of which a notification is sent from
the base station apparatus 3 or the first information; and a CSI
transmission control portion 1017 that specifies a supported value
(Npd) for reporting periodicity of the channel state information on
the basis of the first information in a case where the first downlink
reference UL-DL configuration is specified on the basis of the first
information, specifies a supported value (Npd) for reporting
periodicity of the channel state information on the basis of the second
information in a case where the first downlink reference UL-DL
configuration is specified on the basis of the second information, and
specifies a value (Npd) for reporting periodicity of a subframe for
reporting the channel state information to the base station apparatus 3
on the basis of index information (ICQI/PMI) indicating the value
(Npd) for reporting periodicity of the channel state information, of
which a notification is sent from the base station apparatus 3, and
information indicating the supported value (Npd) for reporting
periodicity of the channel state information.

[0436] In addition, in the above-described embodiment, the mobile station
apparatus 1 and the base station apparatus 3 specify the first downlink
reference UL-DL configuration on the basis of the first information in a
case where the first downlink reference UL-DL configuration is not
specified on the basis of the second information, but may specify a UL-DL
configuration of a predetermined serving cell on the basis of the first
information. As a value (Npd) for reporting periodicity of the
channel state information, an applicable value may be defined on the
basis of the UL-DL configuration of the predetermined serving cell. Here,
the predetermined serving cell may be a primary cell, and may be a
serving cell corresponding to the periodic channel state information. In
other words, the first downlink reference UL-DL configuration specified
on the basis of the first information may also be referred to as a UL-DL
configuration of a serving cell.

[0437] A program which runs in the base station apparatus 3 and the mobile
station apparatus 1 according to the present invention is a program
(which causes a computer to function) which controls a central processing
unit (CPU) and the like so as to realize the functions of the embodiments
according to the present invention. In addition, the information treated
in these devices is temporarily accumulated in a random access memory
(RAM) during the processing thereof, is then stored in various ROMs such
as a flash read only memory (ROM) or hard disk drives (HDDs), and is read
by the CPU as necessary so as to be corrected and be written.

[0438] In addition, part of the mobile station apparatus 1 and the base
station apparatus 3 in the above-described embodiments may be realized by
a computer. In this case, a program for realizing the control function is
recorded on a computer readable recording medium, and the control
function may be realized by a computer system reading and executing the
program recorded on the recording medium.

[0439] In addition, the "computer system" mentioned here is a computer
system which is built into the mobile station apparatus 1 or the base
station apparatus 3, and includes hardware such as an OS or peripheral
devices. Further, the "computer readable recording medium" refers to a
portable medium such as a flexible disk, a magneto-optical disc, a ROM,
or a CD-ROM, and a storage device such as a hard disk built into the
computer system.

[0440] Furthermore, the "computer readable recording medium" may also
include one which dynamically holds a program for a short period of time,
such as a communication line in a case where the program is transmitted
via a network such as the Internet or a communication line such as a
telephone line, and one which holds the program for a specific time, such
as a nonvolatile memory of the computer system which becomes a server or
a client in this case. Moreover, the program may be one which realizes
some of the above-described functions, and may be one which realizes the
above-described functions in combination with a program which has already
been recorded in the computer system.

[0441] In addition, the base station apparatus 3 of the above-described
embodiments may be realized as an aggregate (device groups) constituted
by a plurality of devices. Each of the devices constituting the device
group may include each function, or some or all of the functional blocks
of the base station apparatus 3 according to the embodiments. The device
group may have each general function or each general functional block of
the base station apparatus 3. Further, the mobile station apparatus 1
according to the above-described embodiments may communicate with the
base station apparatus as an aggregate.

[0442] In addition, the base station apparatus 3 in the above-described
embodiments may be an evolved universal terrestrial radio access network
(EUTRAN). Further, the base station apparatus 3 in the above-described
embodiments may have some or all of the functions of the higher node of
eNodeB.

[0443] Further, part or the whole of the mobile station apparatus 1 and
the base station apparatus 3 in the above-described embodiments may be
typically implemented by an LSI which is an integrated circuit, and may
be realized by a chip set. The respective functional blocks of the mobile
station apparatus 1 and the base station apparatus 3 may be separately
formed of a chip, and some or all of the blocks may be integrally formed
as a chip. Further, a technique for an integrated circuit is not limited
to an LSI, and may be realized by a dedicated circuit or a general
purpose processor. Furthermore, in a case where a technique for an
integrated circuit replacing the LSI appears with the advance of a
semiconductor technique, an integrated circuit based on the technique may
be used.

[0444] In addition, in the above-described embodiments, a mobile station
apparatus has been described as an example of a terminal apparatus or a
communication apparatus, but the present invention is not limited
thereto, and is applicable to terminal apparatuses or communication
apparatuses, such as non-movable or stationary electronic apparatuses
installed indoors or outdoors, for example, AV apparatuses, kitchen
apparatuses, cleaning and washing apparatuses, air-conditioning
apparatuses, vending machines, and other pieces of household equipment.

[0445] As mentioned above, although the embodiments of the present
invention have been described in detail with reference to the drawings, a
specific configuration is not limited to the embodiments, and design
modifications and the like may occur within the scope without departing
from the spirit of the invention. In addition, various alterations may
occur in the claims of the present invention, and embodiments obtained by
appropriately combining technical means which are respectively disclosed
in different embodiments are also included in the technical scope of the
present invention. Further, configurations in which the elements which
are disclosed in the above-described respective embodiments and achieve
the same effect are replaced with each other are also included in the
technical scope of the present invention.